Glossary of Terms

The glossary contains definitions for developmental concepts and anatomical terms that were coined or adapted for Schmidtea mediterranea. These terms were deposited into OBO Foundry and can be found with the Ontology Prefix PLANA. Our goal is to provide users with a controlled vocabulary and relationships among terms for describing planarian anatomical features. Our current list of defined terms is not comprehensive, and will be expanded upon in the future to include additional structures, tissue and cell types.​ The ontology is open for browsing and contribution. Visit the source.

Terms with a star (☆) indicate pages with in-depth written descriptions, associated supplemental figures, in situ hybridization images and sequences for transcripts validated by WISH.

termdefinition
Stage 3-5 embryo hemisphere centered around the pole opposite the temporary embryonic pharynx.
Expand aboral hemisphere relations
                    aboral hemisphere subdivision of embryo 
                    aboral hemisphere is a embryonic organism subdivision 
                    aboral hemisphere existence ends at point Stage 6 
                    aboral hemisphere existence starts at point Stage 3 
                    aboral hemisphere existence overlaps Stage 3 
                    aboral hemisphere existence overlaps Stage 4 
                    aboral hemisphere existence overlaps Stage 5 
                    aboral hemisphere existence overlaps Stage 6 
Anatomical structure that consists of cell parts and cell substances and together does not constitute a cell or a tissue.
Expand acellular anatomical structure relations
                    acellular anatomical structure is a material anatomical entity 
Cytoplasm that exhibits molecular interaction for acidic dyes under specific pH conditions.
Expand acidophilic cytoplasm relations
                    acidophilic cytoplasm is a cytoplasm 
One of two distinct histochemical classes of gland cells, these can be found throughout the body but primarily form clusters of subepidermal marginal adhesive glands along the dorsal/ ventral border of the animal. May also be referred to as eosinophilic gland cells.
Expand acidophilic gland cell relations
                    acidophilic gland cell is a gland cell 
A cell projection supported by an assembly of actin filaments.
Expand actin-based cell projection relations
                    actin-based cell projection is a cell projection 
Specialized epithelial cells located along the body margin lining the dorsoventral margin. Adhesion glands are comprised of three cell types, the viscid and relasing gland cells which penetrate through an epithelial anchor cell and terminate at the epithelial surface.
Expand adhesion glands relations
                    adhesion glands is a definitive tissue 
                    adhesion glands existence overlaps asexual adult 
                    adhesion glands existence overlaps juvenile 
                    adhesion glands existence overlaps secretory system 
                    adhesion glands existence overlaps sexually mature adult 
                    adhesion glands part of copulatory region 
                    adhesion glands part of head 
                    adhesion glands part of neck 
                    adhesion glands part of parapharyngeal region 
                    adhesion glands part of secretory system 
                    adhesion glands part of tail 
                    adhesion glands has part anchor cell 
                    adhesion glands has part releasing gland cell 
                    adhesion glands has part viscid gland cell 
A neuron which conveys sensory information centrally from the periphery.
Expand afferent neuron relations
                    afferent neuron is a neuron 
A non-material anatomical entity of two dimensions. Anatomical boundaries are contiguous structures.
Expand anatomical boundary relations
                    anatomical boundary is a immaterial anatomical entity 
Anatomical space which contains portions of one or more body substances and is bounded by the internal surface of one maximally connected anatomical structure. Examples: cranial cavity, pharyngeal recess space, nasal cavity, tooth socket, cavity of serous sac, lumen of stomach, lumen of artery, fornix of vagina.
Expand anatomical cavity relations
                    anatomical cavity is a anatomical space 
Biological entity that is either an individual member of a biological species or constitutes the structural organization of an individual member of a biological species.
Expand anatomical entity relations
An anatomical structure that connects two structures
Expand anatomical junction relations
                    anatomical junction is a immaterial anatomical entity 
Non-material anatomical entity of one dimension, which forms a boundary of an anatomical surface or is a modulation of an anatomical surface.
Expand anatomical line relations
                    anatomical line is a immaterial anatomical entity 
A flat anatomical 2D surface that bisects an anatomical structure or an anatomical space.
Expand anatomical plane relations
                    anatomical plane is a immaterial anatomical entity 
Non-material anatomical entity of zero dimension, which forms a boundary of an anatomical line or surface.
Expand anatomical point relations
                    anatomical point is a immaterial anatomical entity 
Non-material anatomical entity of three dimensions, that is generated by morphogenetic or other physiologic processes; is surrounded by one or more anatomical structures; contains one or more organism substances or anatomical structures.
Expand anatomical space relations
                    anatomical space is a immaterial anatomical entity 
Material anatomical entity that is a single connected structure with inherent 3D shape generated by coordinated expression of the organism's own genome.
Expand anatomical structure relations
                    anatomical structure is a material anatomical entity 
A two dimensional anatomical structure that is the boundary between an anatomical structure and an anatomical substance, an anatomical space or the organism's environment. Examples include the surface of your skin, the surface of the lining of your gut; the surface of the endothelium of you aorta that is in contact with blood.
Expand anatomical surface relations
                    anatomical surface is a immaterial anatomical entity 
Multicellular, connected anatomical structure that has multiple organs as parts and whose parts work together to achieve some shared function.
Expand anatomical system relations
                    anatomical system is a multicellular anatomical structure 
Specialized epithelial cell located along the dorsoventral margin that surrounds the viscid and releasing gland cells.
Expand anchor cell relations
                    anchor cell is a adhesion glands 
                    anchor cell is a terminally differentiated cell 
                    anchor cell part of adhesion glands 
Position along the anteroposterior axis closer to the head rather than the tail.
Expand anterior relations
                    anterior is a definitive organism subdivision 
                    anterior existence overlaps asexual adult 
                    anterior existence overlaps juvenile 
                    anterior existence overlaps sexually mature adult 
                    anterior existence overlaps Stage 7 
                    anterior existence overlaps Stage 8 
A bundle of nerve fibers connecting the two cephalic ganglia.
Expand anterior commissure relations
                    anterior commissure is a brain commissure 
                    anterior commissure part of head 
Distinct anterior cluster of muscle cells located at the midline which express notum, follistatin, zic-1, and foxD.
Expand anterior pole relations
                    anterior pole is a anterior 
                    anterior pole part of head 
                    anterior pole has part muscle cell 
The single, central gut branch of the triclad gut anterior to the definitive pharynx.
Expand anterior primary gut branch relations
                    anterior primary gut branch is a definitive gut 
                    anterior primary gut branch is a definitive tissue 
                    anterior primary gut branch existence starts at point Stage 7 
                    anterior primary gut branch part of definitive gut 
Axis that runs along the long axis of the animal from anterior (head) to posterior (tail). It is perpendicular to the dorsoventral axis and as such, it splits dorsal and ventral regions of the animal to either side.
Expand anteroposterior axis relations
                    anteroposterior axis is a anatomical line 
The apical surface of the single layered epithelium epidermis that is in contact with the environment.
Expand apical epidermis surface relations
                    apical epidermis surface is a anatomical surface 
                    apical epidermis surface is a dorsal epidermis 
                    apical epidermis surface is a ventral epidermis 
                    apical epidermis surface part of dorsal epidermis 
                    apical epidermis surface part of ventral epidermis 
The asexually reproducing Schmidtea mediterranea biotype exists as a constitutive adult, undergoing successive cycles of fission and whole animal regeneration. Asexual Schmidtea mediterranea contain primordial germ cells, but do not possess a reproductive system.
Expand asexual adult relations
                    asexual adult is a Schmidtea mediterranea developmental stage 
Region of the asexual biotype animal between the posterior end of the cephalic ganglia and the anterior end of the definitive pharynx.
Expand asexual neck relations
                    asexual neck is a neck 
Region of the asexual biotype animal lateral to and surrounding the pharyngeal pouch.
Expand asexual parapharyngeal region relations
                    asexual parapharyngeal region is a parapharyngeal region 
                    asexual parapharyngeal region existence overlaps asexual adult 
Expand asexual tail relations
                    asexual tail is a tail 
A neruon whose cell body is within an autonomic ganglion.
Expand autonomic neuron relations
                    autonomic neuron is a peripheral nervous system neuron 
A group of axons linking two or more neuropils and having a common origin, termination
Expand axon tract relations
                    axon tract is a cell projection 
The basal surface of the epidermial epithelium in contact with the basal lamina.
Expand basal epidermis surface relations
                    basal epidermis surface is a anatomical surface 
                    basal epidermis surface is a dorsal epidermis 
                    basal epidermis surface is a ventral epidermis 
                    basal epidermis surface part of dorsal epidermis 
                    basal epidermis surface part of ventral epidermis 
                    basal epidermis surface immediately superficial to basal lamina of epithelium 
Acellular anatomical structure that consists of a thin sheet of fibrous proteins that underlie and support the cells of an epithelium. It separates the cells of an epithelium from any underlying tissue.
Expand basal lamina of epithelium relations
                    basal lamina of epithelium is a acellular anatomical structure 
                    basal lamina of epithelium is a integumental system 
                    basal lamina of epithelium part of integumental system 
                    basal lamina of epithelium immediately deep to dorsal epidermis 
                    basal lamina of epithelium immediately deep to ventral epidermis 
Cytoplasm that exhibits molecular interaction for basic dyes under specific pH conditions.
Expand basophilic cytoplasm relations
                    basophilic cytoplasm is a cytoplasm 
One of two distinct histochemical classes of gland cells, these are found near the ventral mesenchyme, the pharynx and in the dorsal region of the head. May also be called cyanophilic gland cells.
Expand basophilic gland cell relations
                    basophilic gland cell is a gland cell 
A type of interneuron that has two neurites, usually an axon and a dendrite, extending from opposite poles of an ovoid cell body.
Expand bipolar neuron relations
                    bipolar neuron is a interneuron 
A regenerating tissue composed of a proliferative mass of undifferentiated progenitor cells from which new differentiated structures arise
Expand blastema relations
                    blastema is a regenerating anatomical structure 
An undifferentiated, cycling embryonic cell in Stage 1-5 embryos that expresses piwi-1, numerous adult asexual neoblast enriched genes, and early embryo enriched genes.
Expand blastomere relations
                    blastomere is a embryonic cell 
                    blastomere existence ends at point Stage 5 
                    blastomere existence starts at point Stage 1 
                    blastomere existence overlaps Stage 1 
                    blastomere existence overlaps Stage 2 
                    blastomere existence overlaps Stage 3 
                    blastomere existence overlaps Stage 4 
                    blastomere existence overlaps Stage 5 
                    blastomere part of aboral hemisphere 
                    blastomere part of embryonic wall 
                    blastomere part of oral hemisphere 
                    blastomere develops from zygote 
Undifferentiated, zygote-derived cleavage progeny that give rise to temporary embryonic tissues during Stage 2, continue dividing asynchronously in the embryonic wall, and ultimately give rise to neoblasts and adult lineage progenitors beginning in Stage 5.
Expand blastomere compartment relations
                    blastomere compartment is a embryonic structure 
                    blastomere compartment existence ends at point Stage 5 
                    blastomere compartment existence starts at point Stage 1 
                    blastomere compartment existence overlaps Stage 1 
                    blastomere compartment existence overlaps Stage 2 
                    blastomere compartment existence overlaps Stage 3 
                    blastomere compartment existence overlaps Stage 4 
                    blastomere compartment existence overlaps Stage 5 
                    blastomere compartment part of aboral hemisphere 
                    blastomere compartment part of embryonic wall 
                    blastomere compartment part of oral hemisphere 
                    blastomere compartment develops from zygote 
Examples include the outer membranes of double membrane bound organelles such as mitochondria as well as the bounding membranes of single-membrane bound organelles such as lysosomes.
Expand bounding membrane of organelle relations
                    bounding membrane of organelle is a membrane 
The brain is the center of the nervous system in all vertebrate, and most invertebrate, animals. Some primitive animals such as jellyfish and starfish have a decentralized nervous system without a brain, while sponges lack any nervous system at all. In vertebrates, the brain is located in the head, protected by the skull and close to the primary sensory apparatus of vision, hearing, balance, taste, and smell.
Expand brain relations
                    brain is a organ 
                    brain existence overlaps asexual adult 
                    brain existence overlaps juvenile 
                    brain existence overlaps sexually mature adult 
                    brain existence overlaps Stage 7 
                    brain existence overlaps Stage 8 
                    brain part of head 
                    brain has part ganglion 
                    brain has part optic chiasma 
any of the nerve fiber tracts that span the longitudinal fissure between the cerebral and/or cerebellar hemispheres of the brain
Expand brain commissure relations
                    brain commissure is a nervous system commissure 
The passageway connecting the gonopore to the bursa (genital atrium). Part of the copulatory apparatus. During mating, sperm from a partner is deposited into the bursal canal, where it collects in the bursa before travelling up the oviducts to the bursa. Egg capsules pass through the bursal canal as they are laid through the gonopore.
Expand bursal canal relations
                    bursal canal is a copulatory apparatus 
                    bursal canal is a definitive tissue 
Post-mitotic, mesenchymally located epidermal progenitors downstream of the zeta neoblasts.
Expand Category 2 cell relations
                    Category 2 cell is a epidermal progenitor 
Post-mitotic, mesenchymally located epidermal progenitors downstream of the Category 2 cells.
Expand Category 3 cell relations
                    Category 3 cell is a epidermal progenitor 
Post-mitotic, mesenchymally and epidermally located progenitors downstream of the Category 3 cells.
Expand Category 4 cell relations
                    Category 4 cell is a epidermal progenitor 
                    Category 4 cell is a epithelial cell 
Post-mitotic, ciliated epidermal cells.
Expand Category 5 cell relations
                    Category 5 cell is a ciliated epithelial cell 
                    Category 5 cell is a definitive epidermis 
                    Category 5 cell existence starts at point Stage 6 
                    Category 5 cell develops from Category 4 cell 
A anatomical space that is enclosed by a pharynx.
Expand cavity of pharynx relations
                    cavity of pharynx is a anatomical cavity 
                    cavity of pharynx is a definitive pharynx 
                    cavity of pharynx part of definitive pharynx 
A material entity of anatomical origin (part of or deriving from an organism) that has as its parts a maximally connected cell compartment surrounded by a plasma membrane.
Expand cell relations
                    cell is a material anatomical entity 
The attachment of one cell to another cell via adhesion molecules.
Expand cell-cell adhesion relations
                    cell-cell adhesion is a cell-cell contact zone 
Extended zone of intimate apposition between two cells containing one or more types of intercellular junctions.
Expand cell-cell contact zone relations
                    cell-cell contact zone is a cell part 
A cell junction that forms a connection between two or more cells in a multicellular organism; excludes direct cytoplasmic junctions such as ring canals.
Expand cell-cell junction relations
                    cell-cell junction is a cell junction 
A cellular component that forms a specialized region of connection between two or more cells or between a cell and the extracellular matrix. At a cell junction, anchoring proteins extend through the plasma membrane to link cytoskeletal proteins in one cell to cytoskeletal proteins in neighboring cells or to proteins in the extracellular matrix.
Expand cell junction relations
                    cell junction is a cell-cell contact zone 
Anatomical structure that is a direct part of the cell.
Expand cell part relations
                    cell part is a cell 
A prolongation or process extending from a cell.
Expand cell projection relations
                    cell projection is a cell part 
The part of a cell, extracellular environment or virus in which a gene product is located. A gene product may be located in one or more parts of a cell and its location may be as specific as a particular macromolecular complex, that is, a stable, persistent association of macromolecules that function together. Source: NIF_Subcellular:sao-1337158144, GOC:go_curators
Expand cellular component relations
                    cellular component is a cell 
Glands surrounding the copulatory bursa that are required for production of the proteinaceous egg capsule shell and stalk.
Expand cement gland relations
                    cement gland is a copulatory apparatus 
The central nervous system is the core nervous system that serves an integrating and coordinating function. In vertebrates it consists of the neural tube derivatives: the brain and spinal cord. In invertebrates it includes central ganglia plus nerve cord.
Expand central nervous system relations
                    central nervous system is a regional part of nervous system 
                    central nervous system part of nervous system 
                    central nervous system has part afferent neuron 
                    central nervous system has part bipolar neuron 
                    central nervous system has part cholinergic neuron 
                    central nervous system has part commissural neuron 
                    central nervous system has part efferent neuron 
                    central nervous system has part GABAergic neuron 
                    central nervous system has part multipolar neuron 
                    central nervous system has part sympathetic neuron 
                    central nervous system develops from neural progenitor 
Any neuron that is part of a central nervous system.
Expand central nervous system neuron relations
                    central nervous system neuron is a central nervous system 
The planarian brain, consisting of two bilaterally symmetric lobes occupying a ventral position in the head.
Expand cephalic ganglia relations
                    cephalic ganglia is a central nervous system 
                    cephalic ganglia existence starts at point Stage 6 
                    cephalic ganglia existence overlaps Stage 6 
                    cephalic ganglia existence overlaps Stage 7 
                    cephalic ganglia existence overlaps Stage 8 
                    cephalic ganglia part of central nervous system 
                    cephalic ganglia part of head 
Neurons that express choline acetyltransferase.
Expand cholinergic neuron relations
                    cholinergic neuron is a neurosecretory neuron 
The ordered and organized complex of DNA, protein (histones), and sometimes RNA, that forms the chromosome.
Expand chromatin relations
                    chromatin is a nuclear part 
An epithelial cell that has a cillia.
Expand ciliated epithelial cell relations
                    ciliated epithelial cell is a epithelial cell 
                    ciliated epithelial cell part of dorsal stripe 
                    ciliated epithelial cell part of oviduct epithelium 
                    ciliated epithelial cell part of sperm duct epithelium 
                    ciliated epithelial cell part of tuba 
A specialized eukaryotic organelle that consists of a filiform extrusion of the cell surface and of some cytoplasmic parts. Each cilium is largely bounded by an extrusion of the cytoplasmic (plasma) membrane, and contains a regular longitudinal array of microtubules, anchored to a basal body.
Expand cilium relations
                    cilium is a cell projection 
Body wall muscle fibers arrayed around the dorsoventral axis. Upon regeneration, these are thought to be produced de novo in the blastema.
Expand circular muscle fiber relations
                    circular muscle fiber is a definitive tissue 
                    circular muscle fiber is a musculature of body wall 
                    circular muscle fiber is a terminally differentiated cell 
Pluripotent piwi-1+ stem cells that self-renew, form expanding colonies and produce differentiating daughters that contribute to multiple organ systems. cNeoblasts are predicted to be broadly distributed across the anteroposterior axis of the adult worm.
Expand clonogenic neoblast relations
                    clonogenic neoblast is a neoblast compartment 
                    clonogenic neoblast is a stem cell 
                    clonogenic neoblast existence starts at point Stage 6 
                    clonogenic neoblast part of neoblast compartment 
Non-ciliated tubules associated with the distal tubules, which cross the basement membrane and terminate in the dorsal epidermis.
Expand collecting duct relations
                    collecting duct is a definitive tissue 
                    collecting duct is a renal system 
                    collecting duct part of copulatory region 
                    collecting duct part of head 
                    collecting duct part of neck 
                    collecting duct part of parapharyngeal region 
                    collecting duct part of renal system 
                    collecting duct part of tail 
A neuron that has an axon which crosses the midline.
Expand commissural neuron relations
                    commissural neuron is a neuron 
Accessory reproductive structures involved in copulation, egg capsule development and laying.
Expand copulatory apparatus relations
                    copulatory apparatus is a somatic reproductive system element 
                    copulatory apparatus part of copulatory region 
                    copulatory apparatus part of somatic reproductive system element 
A chamber where egg capsules are formed. One or more zygotes and yolk cells produced by the vitelline glands collect in the copulatory bursa; glands surrounding the copulatory bursa produce the egg capsule shell.\n Nascent egg capsules exit the body by passing through the bursal canal and gonopore. The copulatory bursa is synonymous with the term genital atrium.
Expand copulatory bursa relations
                    copulatory bursa is a copulatory apparatus 
                    copulatory bursa is a definitive tissue 
Portion of the sexual biotype body plan immediately posterior to the parapharyngeal region, and immediately anterior to the tail. Encompasses the copulatory apparatus.
Expand copulatory region relations
                    copulatory region is a posterior 
                    copulatory region has part adhesion glands 
                    copulatory region has part bursal canal 
                    copulatory region has part Category 2 cell 
                    copulatory region has part Category 3 cell 
                    copulatory region has part cement gland 
                    copulatory region has part circular muscle fiber 
                    copulatory region has part collecting duct 
                    copulatory region has part copulatory apparatus 
                    copulatory region has part copulatory bursa 
                    copulatory region has part definitive gut 
                    copulatory region has part diagonal muscle fiber 
                    copulatory region has part dorsal stripe 
                    copulatory region has part enteric muscle 
                    copulatory region has part enteric neuron 
                    copulatory region has part gastrodermal plexus 
                    copulatory region has part gonopore 
                    copulatory region has part inner longitudinal muscle fiber 
                    copulatory region has part lumen of digestive tract 
                    copulatory region has part neoblast compartment 
                    copulatory region has part outer longitudinal muscle fiber 
                    copulatory region has part oviduct 
                    copulatory region has part oviduct epithelium 
                    copulatory region has part oviduct lumen 
                    copulatory region has part parenchymal musculature 
                    copulatory region has part penis papilla 
                    copulatory region has part posterior primary gut branch 
                    copulatory region has part protonephridia 
                    copulatory region has part secondary gut branch 
                    copulatory region has part seminal vesicle 
                    copulatory region has part sperm duct 
                    copulatory region has part sperm duct epithelium 
                    copulatory region has part sperm duct lumen 
                    copulatory region has part subepidermal nerve plexus 
                    copulatory region has part submuscular nerve plexus 
                    copulatory region has part tertiary gut branch 
                    copulatory region has part testis 
                    copulatory region has part ventral nerve cord 
                    copulatory region has part vitelline gland 
                    copulatory region has part zeta neoblast 
                    copulatory region specific to sexually mature adult 
                    copulatory region posterior to sexual parapharyngeal region 
Anatomial plane which divides the body into ventral and dorsal regions. This plane always includes the midline and is also known as the frontal plane.
Expand coronal plane relations
                    coronal plane is a anatomical plane 
Fertilization of an oocyte by sperm from a different individual. Reciprocal exchange of sperm occurs during Schmidtea mediterranea copulation.
Expand cross-fertilization relations
                    cross-fertilization is a Schmidtea mediterranea developmental term 
All of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures
Expand cytoplasm relations
                    cytoplasm is a cell part 
Any constituent part of the cytoplasm, all of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.
Expand cytoplasmic part relations
                    cytoplasmic part is a cytoplasm 
Any constituent part of cytoplasmic vesicle, a vesicle formed of membrane or protein, found in the cytoplasm of a cell.
Expand cytoplasmic vesicle part relations
                    cytoplasmic vesicle part is a cytoplasmic part 
A process that is carried out at the cellular level which results in the assembly, arrangement of constituent parts, or disassembly of cytoskeletal structures.
Expand cytoskeleton organization relations
                    cytoskeleton organization is a cytoplasmic part 
Anatomical structure present in juvenile and adult planaria.
Expand definitive anatomical structure relations
                    definitive anatomical structure is a anatomical structure 
A material entity of anatomical origin (part of or deriving from an organism) that has as its parts a maximally connected cell compartment surrounded by a plasma membrane.
Expand definitive cell type relations
                    definitive cell type is a multicellular anatomical structure 
A single cell layer of post-mitotic epithelial cells containing ciliated and non-ciliated cell types forming the exterior surface of the animal.
Expand definitive epidermis relations
                    definitive epidermis is a integumental system 
                    definitive epidermis is a organ 
                    definitive epidermis existence starts at point Stage 5 
                    definitive epidermis existence overlaps Stage 5 
                    definitive epidermis existence overlaps Stage 6 
                    definitive epidermis existence overlaps Stage 7 
                    definitive epidermis existence overlaps Stage 8 
                    definitive epidermis part of copulatory region 
                    definitive epidermis part of integumental system 
                    definitive epidermis part of neck 
                    definitive epidermis part of parapharyngeal region 
                    definitive epidermis has part apical epidermis surface 
                    definitive epidermis has part basal epidermis surface 
                    definitive epidermis has part Category 4 cell 
                    definitive epidermis has part Category 5 cell 
                    definitive epidermis has part dorsal epidermis 
                    definitive epidermis has part ventral epidermis 
                    definitive epidermis develops from Category 2 cell 
                    definitive epidermis develops from Category 3 cell 
                    definitive epidermis develops from epidermal progenitor 
                    definitive epidermis develops from zeta neoblast 
The planarian triclad gut contains a central anterior gut branch connected to two posterior gut branches arranged around the definitive pharynx. Secondary gut branches extend laterally from the primary gut branches, while tertiary gut branches extend from the secondary branches. Food and waste enter and exit the definitive gut through the defintive pharynx.
Expand definitive gut relations
                    definitive gut is a digestive system element 
                    definitive gut is a organ 
                    definitive gut existence starts at point Stage 5 
                    definitive gut existence overlaps Stage 5 
                    definitive gut existence overlaps Stage 6 
                    definitive gut existence overlaps Stage 7 
                    definitive gut existence overlaps Stage 8 
                    definitive gut part of copulatory region 
                    definitive gut part of neck 
                    definitive gut part of parapharyngeal region 
                    definitive gut part of tail 
                    definitive gut has part anterior primary gut branch 
                    definitive gut has part gastrodermal plexus 
                    definitive gut has part gastrodermis 
                    definitive gut has part posterior primary gut branch 
                    definitive gut has part secondary gut branch 
                    definitive gut has part tertiary gut branch 
                    definitive gut develops from gamma neoblast 
Anatomical structure which is a subdivision of a whole adult or juvenile organism, consisting of components of multiple anatomical systems.
Expand definitive organism subdivision relations
                    definitive organism subdivision is a organism subdivision 
A plicate and protrusible organ that is the sole point of entry and exit for the Triclad gut. It contains epithelial, muscular, secretory and neuronal cell types.
Expand definitive pharynx relations
                    definitive pharynx is a digestive system element 
                    definitive pharynx is a organ 
                    definitive pharynx existence starts at point Stage 5 
                    definitive pharynx existence overlaps Stage 5 
                    definitive pharynx existence overlaps Stage 6 
                    definitive pharynx existence overlaps Stage 7 
                    definitive pharynx existence overlaps Stage 8 
                    definitive pharynx part of parapharyngeal region 
                    definitive pharynx has part cavity of pharynx 
                    definitive pharynx has part esophagus 
                    definitive pharynx has part inner pharyngeal circular muscle fiber 
                    definitive pharynx has part inner pharyngeal epithelium 
                    definitive pharynx has part inner pharyngeal longitudinal muscle fiber 
                    definitive pharynx has part inner pharynx nerve plexus 
                    definitive pharynx has part musculature of pharynx 
                    definitive pharynx has part outer pharyngeal circular muscle fiber 
                    definitive pharynx has part outer pharyngeal epithelium 
                    definitive pharynx has part outer pharyngeal longitudinal muscle fiber 
                    definitive pharynx has part outer pharynx nerve plexus 
                    definitive pharynx has part peripheral nervous system 
                    definitive pharynx has part pharyngeal circular muscle fiber 
                    definitive pharynx has part pharyngeal epithelium 
                    definitive pharynx has part pharyngeal longitudinal muscle fiber 
                    definitive pharynx has part pharyngeal radial muscle fiber 
                    definitive pharynx has part pharynx nerve plexus 
foxA1+ neoblasts and their post-mitotic, differentiating daughters required for maintenance and regeneration of the definitive pharynx.
Expand definitive pharynx progenitor cell relations
                    definitive pharynx progenitor cell is a digestive system element 
                    definitive pharynx progenitor cell is a neoblast compartment 
                    definitive pharynx progenitor cell is a progenitor cell 
                    definitive pharynx progenitor cell is a stem cell 
                    definitive pharynx progenitor cell part of neoblast compartment 
Adult tissues built during organogenesis that are present in juveniles at birth.
Expand definitive tissue relations
                    definitive tissue is a tissue 
Anatomical structure that is present during embryonic development.
Expand developing anatomical structure relations
                    developing anatomical structure is a anatomical structure 
Axis perpendicular to both the anteroposterior and dorsoventral axis that runs from the left side of the animal, through the medial region (center) and out to the right side.
Expand dextro-sinister axis relations
                    dextro-sinister axis is a anatomical line 
Body wall muscle fibers arrayed diagonally along the anteroposterior axis.
Expand diagonal muscle fiber relations
                    diagonal muscle fiber is a definitive tissue 
                    diagonal muscle fiber is a musculature of body wall 
                    diagonal muscle fiber is a terminally differentiated cell 
Anatomical system that has as its parts the organs devoted to the ingestion, digestion, and assimilation of food and the discharge of residual wastes.
Expand digestive system relations
                    digestive system is a anatomical system 
                    digestive system existence overlaps asexual adult 
                    digestive system existence overlaps juvenile 
                    digestive system existence overlaps sexually mature adult 
Any of the organs or elements that are part of the digestive system. Examples: tongue, esophagus, spleen, crop, lunge feeding organ, tooth elements.
Expand digestive system element relations
                    digestive system element is a digestive system 
                    digestive system element part of digestive system 
Embryonic development producing juvenile animals with body plans and feeding behavior similar to adults. Juveniles grow and mature into adults without undergoing metamorphosis.
Expand direct development relations
                    direct development is a Schmidtea mediterranea developmental term 
A derived form of early embryonic cleavage present in ectolecithal embryos. Blastomeres divide asynchronously within a yolk syncytium, and division progeny do not remain in direct contact with one another.
Expand dispersed cleavage relations
                    dispersed cleavage is a Schmidtea mediterranea developmental term 
Sinusoidal, non-ciliated tubules connected to proximal tubules within the parenchyma. Tubules are formed via intercellular junctions between two epithelial cells.
Expand distal tubule relations
                    distal tubule is a definitive tissue 
                    distal tubule is a protonephridia 
                    distal tubule part of protonephridia 
A neuron that expresses the neurotransmitter dopamine.
Expand dopaminergic neuron relations
                    dopaminergic neuron is a neurosecretory neuron 
Position along the dorsoventral axis that is above the anteroposterior axis, or closer to the back.
Expand dorsal relations
                    dorsal is a definitive organism subdivision 
                    dorsal existence overlaps asexual adult 
                    dorsal existence overlaps juvenile 
                    dorsal existence overlaps sexually mature adult 
                    dorsal existence overlaps Stage 7 
                    dorsal existence overlaps Stage 8 
                    dorsal has part dorsal stripe 
                    dorsal has part eye 
                    dorsal has part sperm duct 
                    dorsal has part testis 
Single cell layer of dorsal, post-mitotic, epithelial cells containing the dorsal stripe.
Expand dorsal epidermis relations
                    dorsal epidermis is a definitive epidermis 
                    dorsal epidermis part of definitive epidermis 
                    dorsal epidermis part of head 
                    dorsal epidermis part of tail 
Ciliated epithelial cells along the dorsal midline.
Expand dorsal stripe relations
                    dorsal stripe is a dorsal epidermis 
                    dorsal stripe part of dorsal 
                    dorsal stripe part of dorsal epidermis 
Axis that runs along the short axis of the animal, perpendicular to the anteroposterior axis, running from the dorsal (back) side of the animal to the ventral (belly) side of the animal. This axis splits anterior and posterior regions of the animal to either side.
Expand dorsoventral axis relations
                    dorsoventral axis is a anatomical line 
Turbellarian (freshwater flatworm) embryos that undergo a modified form of cleavage due to separation of oocyte and yolk. Yolk is not contained within oocytes, and is produced by somatic vitellogenic gland cells.
Expand ectolecithal embryo relations
                    ectolecithal embryo is a Schmidtea mediterranea developmental term 
A neuron which sends impulses peripherally to activate muscles or secretory cells.
Expand efferent neuron relations
                    efferent neuron is a neuron 
A proteinaceous, semi-permeable shell housing yolk cells and one or more embryos. Egg capsules are anchored to a substrate via a stalk.
Expand egg capsule relations
                    egg capsule is a reproductive system product 
                    egg capsule produced by sexually mature adult 
A cell whose function is determined by its response to an electric signal.
Expand electrically responsive cell relations
                    electrically responsive cell is a nervous system 
A cell that initiates an electrical signal and passes that signal to another cell.
Expand electrically signaling cell relations
                    electrically signaling cell is a nervous system 
Spermatids expressing protein kinase A undergoing morphogenic changes to make mature sperm.
Expand elongate spermatid relations
                    elongate spermatid is a spermatid 
                    elongate spermatid develops from round spermatid 
Anatomical entity that comprises the organism in the early stages of growth and differentiation that are characterized by cleavage, the laying down of fundamental tissues, and the formation of primitive organs and organ systems. For example, for mammals, the process would begin with zygote formation and end with birth. For insects, the process would begin at zygote formation and end with larval hatching. For plant zygotic embryos, this would be from zygote formation to the end of seed dormancy. For plant vegetative embryos, this would be from the initial determination of the cell or group of cells to form an embryo until the point when the embryo becomes independent of the parent plant.
Expand embryo relations
                    embryo is a reproductive system product 
                    embryo is a Schmidtea mediterranea developmental stage 
A cell of the embryo.
Expand embryonic cell relations
                    embryonic cell is a developing anatomical structure 
The first few specialized divisions of an activated animal egg.
Expand embryonic cleavage relations
                    embryonic cleavage is a Schmidtea mediterranea developmental term 
                    embryonic cleavage existence ends at point Stage 2 
                    embryonic cleavage existence starts at point Stage 1 
                    embryonic cleavage existence overlaps Stage 1 
                    embryonic cleavage existence overlaps Stage 2 
A cryptic digestive system in Stage 3-6 embryos comprised of temporary embryonic cell types and organs, including the temporary embryonic pharynx and primitive gut cells. Embryonic gut cells, likely produced from blastomeres, form a phagocytic tissue layer surrounding the inner gut cavity during Stages 4-6. It is not known whether the embryonic gut is temporary embryonic tissue or a definitive tissue. For convenience, the embryonic gut is currently designated as an extraembryonic structure because cell type specific markers for the embryonic gut do not stain the definitive gut in hatchlings or adult animals.
Expand embryonic digestive system relations
                    embryonic digestive system is a extraembryonic structure 
Any of the cell types, tissues, organs or elements that are part of the embryonic digestive system. Examples include the temporary embryonic pharynx, primitive gut cells, embryonic gut cells and the central gut cavity.
Expand embryonic digestive system element relations
                    embryonic digestive system element is a embryonic digestive system 
Lumen of embryonic digestive tract, prior to formation of the branched defintive gut.
Expand embryonic gut cavity relations
                    embryonic gut cavity is a embryonic digestive system element 
                    embryonic gut cavity existence starts at point Stage 3 
                    embryonic gut cavity existence overlaps Stage 3 
                    embryonic gut cavity existence overlaps Stage 4 
                    embryonic gut cavity existence overlaps Stage 5 
                    embryonic gut cavity existence overlaps Stage 6 
                    embryonic gut cavity part of aboral hemisphere 
                    embryonic gut cavity part of oral hemisphere 
Dispersed, phagocytic gut cells that appear during Stage 4 and ultimately generate a honeycomb-like lattice surrounding the central gut cavity in Stage 5 embryos. Early embryonic gut cell specific transcripts are expressed from Stage 4-6, and are downregulated during Stage 7.
Expand embryonic gut cell relations
                    embryonic gut cell is a embryonic digestive system element 
                    embryonic gut cell existence ends at point Stage 6 
                    embryonic gut cell existence starts at point Stage 4 
                    embryonic gut cell existence overlaps Stage 4 
                    embryonic gut cell existence overlaps Stage 5 
                    embryonic gut cell existence overlaps Stage 6 
                    embryonic gut cell part of aboral hemisphere 
                    embryonic gut cell part of embryonic digestive system 
                    embryonic gut cell part of oral hemisphere 
The surface of phagocytic embryonic gut cells in contact with ingested yolk cells.
Expand embryonic gut cell surface relations
                    embryonic gut cell surface is a anatomical surface 
                    embryonic gut cell surface is a embryonic digestive system element 
                    embryonic gut cell surface existence ends at point Stage 6 
                    embryonic gut cell surface existence starts at point Stage 4 
                    embryonic gut cell surface existence overlaps Stage 4 
                    embryonic gut cell surface existence overlaps Stage 5 
                    embryonic gut cell surface existence overlaps Stage 6 
                    embryonic gut cell surface part of aboral hemisphere 
                    embryonic gut cell surface part of oral hemisphere 
Anatomical structure which is a subdivision of a whole developing/ embryonic organism, consisting of components of multiple anatomical systems.
Expand embryonic organism subdivision relations
                    embryonic organism subdivision is a organism subdivision 
Anatomical structure that is part of an embryo.
Expand embryonic structure relations
                    embryonic structure is a developing anatomical structure 
The parenchymal space between the gut cavity and the primitive ectoderm containing undifferentiated blastomeres in Stage 3-5 embryos.
Expand embryonic wall relations
                    embryonic wall is a developing anatomical structure 
                    embryonic wall is a embryonic organism subdivision 
                    embryonic wall existence ends at point Stage 5 
                    embryonic wall existence starts at point Stage 3 
                    embryonic wall existence overlaps Stage 3 
                    embryonic wall existence overlaps Stage 4 
                    embryonic wall existence overlaps Stage 5 
                    embryonic wall has part blastomere 
                    embryonic wall has part yolk cell 
Network of interconnected, flattened, and/or tubular membrane, known as cisternae. This membrane is contiguous with the outer nuclear membrane. The endoplasmic reticulum is involved in both protein and lipid synthesis.
Expand endoplasmic reticulum relations
                    endoplasmic reticulum is a intracellular membrane-bounded organelle 
                    endoplasmic reticulum is a membrane-bounded organelle 
Visceral muscle surrounding the definitive gut.
Expand enteric muscle relations
                    enteric muscle is a definitive tissue 
                    enteric muscle is a digestive system element 
                    enteric muscle is a musculature system 
                    enteric muscle existence starts at point Stage 7 
                    enteric muscle existence overlaps Stage 7 
                    enteric muscle existence overlaps Stage 8 
                    enteric muscle part of copulatory region 
                    enteric muscle part of neck 
                    enteric muscle part of parapharyngeal region 
                    enteric muscle part of tail 
                    enteric muscle has part muscle cell 
Neuron that is part of the enteric nervous system.
Expand enteric neuron relations
                    enteric neuron is a autonomic neuron 
                    enteric neuron is a gastrodermal plexus 
                    enteric neuron is a pharynx nerve plexus 
                    enteric neuron is a terminally differentiated cell 
                    enteric neuron part of gastrodermal plexus 
                    enteric neuron part of head 
                    enteric neuron part of pharynx nerve plexus 
Mitotically active zeta neoblasts and their post-mitotic descendants which undergo progressive differentiation and outward directed movement through the mesenchyme prior to incorporation into the epidermis, where terminal differentiation occurs.
Expand epidermal progenitor relations
                    epidermal progenitor is a definitive epidermis 
                    epidermal progenitor is a progenitor cell 
                    epidermal progenitor part of tail 
A cell that is usually found in a two-dimensional sheet with a free surface. The cell has a cytoskeleton that allows for tight cell to cell contact and for cell polarity where the apical part is directed towards the lumen and the basal part to the basal lamina.
Expand epithelial cell relations
                    epithelial cell is a terminally differentiated cell 
                    epithelial cell part of dorsal epidermis 
                    epithelial cell part of gastrodermis 
                    epithelial cell part of inner pharyngeal epithelium 
                    epithelial cell part of outer pharyngeal epithelium 
                    epithelial cell part of ventral epidermis 
A part of an epithelial cell.
Expand epithelial cell component relations
                    epithelial cell component is a epithelial cell 
Attachment between the triclad gut and the proximal end of the definitive pharynx.
Expand esophagus relations
                    esophagus is a definitive pharynx 
                    esophagus is a definitive tissue 
                    esophagus part of definitive pharynx 
A dispersed and relatively uncompacted form of chromatin.
Expand euchromatin relations
                    euchromatin is a chromatin 
A motor neuron that is capable of directly inducing muscle contraction.
Expand excitatory motor neuron relations
                    excitatory motor neuron is a motor neuron 
Anatomical structures that exist outside of cells; non-cellular.
Expand extracellular component relations
                    extracellular component is a cell part 
Organized structure of distinctive morphology and function, occurring outside the cell. Includes, for example, extracellular membrane vesicles (EMVs) and the cellulosomes of anaerobic bacteria and fungi.
Expand extracellular organelle relations
                    extracellular organelle is a extracellular component 
Expand extraembryonic cell relations
                    extraembryonic cell is a developing anatomical structure 
A multicellular anatomical structure that is associated with an embryo and derived from the zygote from which it develops, but which does not contribute to the embryo proper or to structures that are part of the same organism after embryogenesis.
Expand extraembryonic structure relations
                    extraembryonic structure is a developing anatomical structure 
An organ that detects light.
Expand eye relations
                    eye is a organ 
                    eye is a visual system 
                    eye existence overlaps Stage 7 
                    eye existence overlaps Stage 8 
                    eye part of head 
                    eye part of visual system 
                    eye has part optic cup 
                    eye has part photoreceptor neuron 
                    eye has part pigment cup cell 
                    eye develops from trail cell 
Female germ cell is a germ cell that supports female gamete production.
Expand female germ cell relations
                    female germ cell is a germ cell 
A piwi-1+, nanos+ cell residing in the ovary that self-renews and give rise to oogonial cells that differentiate into oocytes.
Expand female germline stem cell relations
                    female germline stem cell is a female germ cell 
                    female germline stem cell is a ovary 
                    female germline stem cell is a stem cell 
                    female germline stem cell part of ovary 
                    female germline stem cell develops from primordial germ cell 
Terminal structure of protonephridia unit; consists of flame cells.
Expand flame bulb relations
                    flame bulb is a protonephridia 
                    flame bulb part of protonephridia 
Terminal structure of the protonephridia unit, capping the proximal tubules. Flame cells are defined by the filtration weir, which consists of closely apposed strands of cytoplasm surrounding a central cilia bundle, and by numerous microvilli between weir and cilia. Positive for acetyated tubulin.
Expand flame cell relations
                    flame cell is a flame bulb 
                    flame cell is a terminally differentiated cell 
                    flame cell part of flame bulb 
Neurons that express glutamine decarboxylase.
Expand GABAergic neuron relations
                    GABAergic neuron is a neurosecretory neuron 
A mature sexual reproductive cell having a single set of unpaired chromosomes.
Expand gamete relations
                    gamete is a germ cell 
                    gamete is a reproductive system product 
The production of haploid germ cells from diploid precursor cells through meiosis.
Expand gametogenesis relations
                    gametogenesis is a Schmidtea mediterranea developmental term 
                    gametogenesis existence starts at point juvenile 
                    gametogenesis existence overlaps juvenile 
                    gametogenesis existence overlaps sexually mature adult 
                    gametogenesis specific to sexually mature adult 
An abundant neoblast subclass, exhibiting enriched expression of gata456a, hnf4, prox-1 and nkx2.2, implicated in maintenance and regeneration of the definitive gut.
Expand gamma neoblast relations
                    gamma neoblast is a digestive system element 
                    gamma neoblast is a neoblast compartment 
                    gamma neoblast is a progenitor cell 
                    gamma neoblast is a stem cell 
                    gamma neoblast part of neoblast compartment 
A biological tissue mass of nerve cell bodies.
Expand ganglion relations
                    ganglion is a definitive tissue 
                    ganglion is a nervous system 
                    ganglion part of brain 
A thin net of single nerve fibers located around the gut.
Expand gastrodermal plexus relations
                    gastrodermal plexus is a definitive gut 
                    gastrodermal plexus is a nerve plexus 
                    gastrodermal plexus is a peripheral nervous system 
                    gastrodermal plexus part of definitive gut 
                    gastrodermal plexus part of peripheral nervous system 
The single cell layer columnar epithelial lining of the intestine. The gastrodermis is surrounded by a basal lamina and enteric muscle.
Expand gastrodermis relations
                    gastrodermis is a definitive gut 
                    gastrodermis is a definitive tissue 
                    gastrodermis part of anterior primary gut branch 
                    gastrodermis part of posterior primary gut branch 
                    gastrodermis part of secondary gut branch 
                    gastrodermis part of tertiary gut branch 
1. A gamete (as an egg or sperm cell) or one of its antecedent cells. 2. A mature male or female germ cell usually possessing a haploid chromosome set and capable of initiating formation of a new diploid individual by fusion with a gamete of the opposite sex.
Expand germ cell relations
                    germ cell is a definitive cell type 
Specialized insunk epithelial cells located in the mesenchyme that participate in mucus secretion. They are characterized by elongated cell bodies with long cytoplasmic projections that terminate between, or penetrate directly through epithelial cells and form a secretory pore at the surface.
Expand gland cell relations
                    gland cell is a secretory system 
A non-neuronal cell of the nervous system. They not only provide physical support, but also respond to injury, regulate the ionic and chemical composition of the extracellular milieu, guide neuronal migration during development, and exchange metabolites with neurons.
Expand glial cell relations
                    glial cell is a neuron associated cell (sensu Nematoda and Protostomia) 
                    glial cell is a terminally differentiated cell 
Secretory cells that release digestive enzymes into the lumen of the intestine.
Expand goblet cell relations
                    goblet cell is a gastrodermis 
                    goblet cell is a terminally differentiated cell 
                    goblet cell part of gastrodermis 
A compound membranous cytoplasmic organelle of eukaryotic cells, consisting of flattened, ribosome-free vesicles arranged in a more or less regular stack. The Golgi apparatus differs from the endoplasmic reticulum in often having slightly thicker membranes, appearing in sections as a characteristic shallow semicircle so that the convex side (cis or entry face) abuts the endoplasmic reticulum, secretory vesicles emerging from the concave side (trans or exit face). In vertebrate cells there is usually one such organelle, while in invertebrates and plants, where they are known usually as dictyosomes, there may be several scattered in the cytoplasm. The Golgi apparatus processes proteins produced on the ribosomes of the rough endoplasmic reticulum; such processing includes modification of the core oligosaccharides of glycoproteins, and the sorting and packaging of proteins for transport to a variety of cellular locations. Three different regions of the Golgi are now recognized both in terms of structure and function: cis, in the vicinity of the cis face, trans, in the vicinity of the trans face, and medial, lying between the cis and trans regions.
Expand Golgi apparatus relations
                    Golgi apparatus is a intracellular membrane-bounded organelle 
                    Golgi apparatus is a membrane-bounded organelle 
Reproductive organ that produces and releases eggs (ovary) or sperm (testis).
Expand gonad relations
                    gonad is a reproductive system 
                    gonad existence starts at point juvenile 
The gonopore, a component of the copulatory apparatus, is an opening located on the ventral side of the animal posterior to the definitive pharynx. The gonopore is the sole point of exit and entry for the reproductive system, allowing from reciprocal exchange of sperm during copulation and egg capsule laying.
Expand gonopore relations
                    gonopore is a copulatory apparatus 
                    gonopore is a definitive tissue 
The head is the anterior-most division of the body [GO].
Expand head relations
                    head is a anterior 
                    head has part adhesion glands 
                    head has part anterior commissure 
                    head has part anterior pole 
                    head has part brain 
                    head has part cephalic ganglia 
                    head has part circular muscle fiber 
                    head has part collecting duct 
                    head has part diagonal muscle fiber 
                    head has part dorsal stripe 
                    head has part enteric neuron 
                    head has part eye 
                    head has part inner longitudinal muscle fiber 
                    head has part lateral branches 
                    head has part neoblast compartment 
                    head has part outer longitudinal muscle fiber 
                    head has part parenchymal musculature 
                    head has part protonephridia 
                    head has part subepidermal nerve plexus 
                    head has part submuscular nerve plexus 
                    head has part ventral nerve cord 
A compact and highly condensed form of chromatin.
Expand heterochromatin relations
                    heterochromatin is a chromatin 
Anatomical entity that has no mass.
Expand immaterial anatomical entity relations
                    immaterial anatomical entity is a anatomical entity 
Inner most body wall muscle fibers arrayed along the anteroposterior axis. These fibers are thicker than the outer longitudinal muscle fibers. The pattern of these muscles differs along the dorsoventral axis, with the dorsal arrangement converging at the central zone of the anterior pole. The ventral arrangement is more parallel or may diverge slightly as it approaches the ventral pole.
Expand inner longitudinal muscle fiber relations
                    inner longitudinal muscle fiber is a longitudinal muscle fiber 
Pharynx muscle fiber that runs circumferentially about the pharynx and lies just beneath the inner logitudinal pharynx muscle fibers.
Expand inner pharyngeal circular muscle fiber relations
                    inner pharyngeal circular muscle fiber is a pharyngeal circular muscle fiber 
                    inner pharyngeal circular muscle fiber immediately superficial to inner pharyngeal longitudinal muscle fiber 
                    inner pharyngeal circular muscle fiber immediately deep to inner pharyngeal epithelium 
Heavily ciliated epidermal cells covering the inner surface of the pharynx shaft.
Expand inner pharyngeal epithelium relations
                    inner pharyngeal epithelium is a pharyngeal epithelium 
                    inner pharyngeal epithelium part of pharyngeal epithelium 
                    inner pharyngeal epithelium immediately superficial to inner pharyngeal circular muscle fiber 
Pharynx muscle fibers running anteroposterior which lie beneath both the inner circular muscle fibers and the apical, ciliated portion of the epithium lining the lumenal surface.
Expand inner pharyngeal longitudinal muscle fiber relations
                    inner pharyngeal longitudinal muscle fiber is a pharyngeal longitudinal muscle fiber 
                    inner pharyngeal longitudinal muscle fiber immediately deep to inner pharyngeal circular muscle fiber 
Ring of the pharynx nerve plexus that is proximal to the lumen.
Expand inner pharynx nerve plexus relations
                    inner pharynx nerve plexus is a pharynx nerve plexus 
                    inner pharynx nerve plexus part of pharynx nerve plexus 
Connected anatomical system that forms a barrier between an animal and its environment. In vertebrates, the integumental system consists of the epidermis, dermis plus associated glands and adnexa such as hair and scales. In invertebrates, the integumental system may include cuticle.
Expand integumental system relations
                    integumental system is a anatomical system 
                    integumental system existence overlaps asexual adult 
                    integumental system existence overlaps juvenile 
                    integumental system existence overlaps sexually mature adult 
Most generally any neuron which is not motor or sensory. Interneurons may also refer to neurons whose axons remain within a particular brain region as contrasted with projection neurons which have axons projecting to other brain regions.
Expand interneuron relations
                    interneuron is a neuron 
Absorptive digestive cells that engulf food particles for intracellular digestion.
Expand intestinal phagocyte relations
                    intestinal phagocyte is a gastrodermis 
                    intestinal phagocyte is a terminally differentiated cell 
                    intestinal phagocyte part of gastrodermis 
Organized structure of distinctive morphology and function, bounded by a single or double lipid bilayer membrane and occurring within the cell. Includes the nucleus, mitochondria, plastids, vacuoles, and vesicles. Excludes the plasma membrane.
Expand intracellular membrane-bounded organelle relations
                    intracellular membrane-bounded organelle is a intracellular organelle 
Organized structure of distinctive morphology and function, not bounded by a lipid bilayer membrane and occurring within the cell. Includes ribosomes, the cytoskeleton and chromosomes
Expand intracellular non-membrane-bounded organelle relations
                    intracellular non-membrane-bounded organelle is a intracellular organelle 
Organized structure of distinctive morphology and function, occurring within the cell. Includes the nucleus, mitochondria, plastids, vacuoles, vesicles, ribosomes and the cytoskeleton. Excludes the plasma membrane.
Expand intracellular organelle relations
                    intracellular organelle is a intracellular part 
Any constituent part of the living contents of a cell; the matter contained within (but not including) the plasma membrane, usually taken to exclude large vacuoles and masses of secretory or ingested material. In eukaryotes it includes the nucleus and cytoplasm.
Expand intracellular part relations
                    intracellular part is a cell part 
A sexually immature member of the Schmidtea mediterranea sexuallly reproducing biotype.
Expand juvenile relations
                    juvenile is a Schmidtea mediterranea developmental stage 
Nerve branches that extend from the lateral side of each cephalic ganglia lobe. Each lobe has nine lateral branches which terminate in sensory organs. Evidence suggests they play a role in chemosensation.
Expand lateral branches relations
                    lateral branches is a central nervous system 
                    lateral branches part of cephalic ganglia 
Body wall muscle fibers arrayed along the anteroposterior axis. Upon regeneration, these muscles are thought to be established from truncated pre-existing fibers.
Expand longitudinal muscle fiber relations
                    longitudinal muscle fiber is a definitive tissue 
                    longitudinal muscle fiber is a musculature of body wall 
                    longitudinal muscle fiber is a terminally differentiated cell 
The surface of the gut lumen in contact with ingested food.
Expand lumen gut surface relations
                    lumen gut surface is a anatomical surface 
                    lumen gut surface existence overlaps asexual adult 
                    lumen gut surface existence overlaps juvenile 
                    lumen gut surface existence overlaps sexually mature adult 
                    lumen gut surface part of gastrodermis 
                    lumen gut surface immediately superficial to lumen of digestive tract 
An anatomical space that is surrounded by a digestive tract.
Expand lumen of digestive tract relations
                    lumen of digestive tract is a anatomical cavity 
                    lumen of digestive tract is a digestive system element 
                    lumen of digestive tract existence overlaps Stage 5 
                    lumen of digestive tract existence overlaps Stage 6 
                    lumen of digestive tract existence overlaps Stage 7 
                    lumen of digestive tract existence overlaps Stage 8 
                    lumen of digestive tract part of copulatory region 
                    lumen of digestive tract part of neck 
                    lumen of digestive tract part of parapharyngeal region 
                    lumen of digestive tract part of tail 
The digestive component of the cell. They are homogenous, dense, membrane bound organelles filled with acid hydrolases which break down polymers.
Expand lysosome relations
                    lysosome is a intracellular membrane-bounded organelle 
                    lysosome is a membrane-bounded organelle 
A principle subdivision of an organism that includes all structures along the primary axis, typically the anterior-posterior axis, from head to tail, including structures of the body proper where present (for example, ribs), but excluding appendages.
Expand main body axis relations
                    main body axis is a anatomical line 
A male germ cell is a germ cell that supports male gamete production.
Expand male germ cell relations
                    male germ cell is a germ cell 
gh4+, nanos+ cells residing at the testis periphery that self-renew and give rise to differentiating daughters that will ultimately produce haploid sperm.
Expand male germline stem cell relations
                    male germline stem cell is a male germ cell 
                    male germline stem cell is a stem cell 
                    male germline stem cell is a testis 
                    male germline stem cell part of testis 
                    male germline stem cell develops from primordial germ cell 
Anatomical entity that has mass.
Expand material anatomical entity relations
                    material anatomical entity is a anatomical entity 
A cell specialized to transduce mechanical stimuli and relay that information centrally in the nervous system.
Expand mechanoreceptor cell relations
                    mechanoreceptor cell is a sensory neuron 
Axis that runs from the center of the body, starting at the anteroposterior axis and out the the lateral (left, right, dorsal or ventral) surface of the animal.
Expand mediolateral axis relations
                    mediolateral axis is a anatomical line 
A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it.
Expand membrane relations
                    membrane is a cell part 
Organized structure of distinctive morphology and function, bounded by a single or double lipid bilayer membrane. Includes the nucleus, mitochondria, plastids, vacuoles, and vesicles. Excludes the plasma membrane.
Expand membrane-bounded organelle relations
                    membrane-bounded organelle is a organelle 
Any constituent part of a membrane, a double layer of lipid molecules that encloses all cells, and, in eukaryotes, many organelles; may be a single or double lipid bilayer; also includes associated proteins.
Expand membrane part relations
                    membrane part is a membrane 
Thin cylindrical membrane-covered projections on the surface of an animal cell containing a core bundle of actin filaments.
Expand microvillus relations
                    microvillus is a cell projection 
A spherical to rod shaped organelle that generates the majority of a cell's supply of ATP via cellular respiration. Mitochondria have their own genome and consist of outer and inner membranes, the latter folds inward to form cristae. This folding increases the surface area of the membrane and thus increases the space available to produce ATP. The inner and outer membranes are separated by an intermembrane space, and the inner membrane encloses the matrix.
Expand mitochondrion relations
                    mitochondrion is a intracellular membrane-bounded organelle 
                    mitochondrion is a membrane-bounded organelle 
An efferent neuron that passes from the central nervous system or a ganglion toward or to a muscle and conducts an impulse that causes or inhibits movement.
Expand motor neuron relations
                    motor neuron is a efferent neuron 
The sole point of entry and exit for the Triclad planarian flatworm gut. The mouth is connected to the pharyngeal pouch to allow for exit and re-entry of the definitive pharynx on the ventral side of the animal. The mouth contains several cell types, including epithelial cells, muscle, and secretory cells.
Expand mouth relations
                    mouth is a definitive tissue 
                    mouth is a digestive system element 
                    mouth existence starts at point Stage 6 
                    mouth existence overlaps Stage 6 
                    mouth existence overlaps Stage 7 
                    mouth existence overlaps Stage 8 
                    mouth part of parapharyngeal region 
                    mouth has part epithelial cell 
                    mouth has part muscle cell 
                    mouth has part secretory cell 
An anatomical structure that has more than one cell as a part.
Expand multicellular anatomical structure relations
                    multicellular anatomical structure is a definitive anatomical structure 
Neuron with an axon and two or more dendrites.
Expand multipolar neuron relations
                    multipolar neuron is a neuron 
A mature contractile cell, commonly known as a myocyte. This cell has as part of its cytoplasm myofibrils organized in various patterns.
Expand muscle cell relations
                    muscle cell is a electrically responsive cell 
                    muscle cell is a terminally differentiated cell 
                    muscle cell existence starts at point Stage 2 
                    muscle cell existence overlaps Stage 2 
                    muscle cell existence overlaps Stage 3 
                    muscle cell existence overlaps Stage 4 
                    muscle cell existence overlaps Stage 5 
                    muscle cell existence overlaps Stage 6 
                    muscle cell existence overlaps Stage 7 
                    muscle cell existence overlaps Stage 8 
                    muscle cell part of anterior pole 
                    muscle cell part of bursal canal 
                    muscle cell part of circular muscle fiber 
                    muscle cell part of diagonal muscle fiber 
                    muscle cell part of enteric muscle 
                    muscle cell part of gonopore 
                    muscle cell part of inner longitudinal muscle fiber 
                    muscle cell part of inner pharyngeal circular muscle fiber 
                    muscle cell part of inner pharyngeal longitudinal muscle fiber 
                    muscle cell part of mouth 
                    muscle cell part of outer longitudinal muscle fiber 
                    muscle cell part of outer pharyngeal circular muscle fiber 
                    muscle cell part of outer pharyngeal longitudinal muscle fiber 
                    muscle cell part of oviduct 
                    muscle cell part of parenchymal musculature 
                    muscle cell part of pharyngeal radial muscle fiber 
                    muscle cell part of temporary embryonic pharynx 
                    muscle cell part of tuba 
myoD+ neoblasts and their post-mitotic, differentiating daughters implicated in the maintenance and regeneration of muscles.
Expand muscle progenitor relations
                    muscle progenitor is a musculature system 
                    muscle progenitor is a neoblast compartment 
                    muscle progenitor is a progenitor cell 
                    muscle progenitor is a stem cell 
                    muscle progenitor part of neoblast compartment 
Any collection of muscles that is part of a body wall [Automatically generated definition].
Expand musculature of body wall relations
                    musculature of body wall is a musculature system 
                    musculature of body wall is a organ 
                    musculature of body wall existence overlaps Stage 6 
                    musculature of body wall existence overlaps Stage 7 
                    musculature of body wall existence overlaps Stage 8 
                    musculature of body wall part of copulatory region 
                    musculature of body wall part of head 
                    musculature of body wall part of neck 
                    musculature of body wall part of parapharyngeal region 
                    musculature of body wall part of tail 
                    musculature of body wall has part muscle cell 
The total musculature within the pharynx.
Expand musculature of pharynx relations
                    musculature of pharynx is a definitive pharynx 
                    musculature of pharynx is a definitive tissue 
                    musculature of pharynx is a musculature system 
                    musculature of pharynx part of definitive pharynx 
Total musculature of the planarian body.
Expand musculature system relations
                    musculature system is a anatomical system 
                    musculature system existence overlaps asexual adult 
                    musculature system existence overlaps juvenile 
                    musculature system existence overlaps sexually mature adult 
Region of the juvenile or adult animal between the posterior end of the cephalic ganglia and the anterior end of the definitive pharynx.
Expand neck relations
                    neck is a anterior 
                    neck has part adhesion glands 
                    neck has part anterior primary gut branch 
                    neck has part Category 3 cell 
                    neck has part circular muscle fiber 
                    neck has part collecting duct 
                    neck has part definitive gut 
                    neck has part diagonal muscle fiber 
                    neck has part dorsal stripe 
                    neck has part enteric muscle 
                    neck has part enteric neuron 
                    neck has part gastrodermal plexus 
                    neck has part gastrodermis 
                    neck has part inner longitudinal muscle fiber 
                    neck has part lumen of digestive tract 
                    neck has part neoblast compartment 
                    neck has part outer longitudinal muscle fiber 
                    neck has part parenchymal musculature 
                    neck has part protonephridia 
                    neck has part secondary gut branch 
                    neck has part subepidermal nerve plexus 
                    neck has part submuscular nerve plexus 
                    neck has part tertiary gut branch 
                    neck has part ventral nerve cord 
                    neck has part zeta neoblast 
                    neck posterior to head 
A heterogeneous population of pluripotent, somatic adult stem cells and lineage primed progenitors that are required for maintenance and regeneration of all cell types in planaria, including the germline.
Expand neoblast compartment relations
                    neoblast compartment is a anatomical system 
                    neoblast compartment is a definitive tissue 
                    neoblast compartment existence starts at point Stage 5 
                    neoblast compartment existence overlaps asexual adult 
                    neoblast compartment existence overlaps juvenile 
                    neoblast compartment existence overlaps sexually mature adult 
                    neoblast compartment existence overlaps Stage 5 
                    neoblast compartment existence overlaps Stage 6 
                    neoblast compartment existence overlaps Stage 7 
                    neoblast compartment existence overlaps Stage 8 
                    neoblast compartment part of copulatory region 
                    neoblast compartment part of head 
                    neoblast compartment part of neck 
                    neoblast compartment part of parapharyngeal region 
                    neoblast compartment part of tail stripe 
                    neoblast compartment has part clonogenic neoblast 
                    neoblast compartment has part definitive pharynx progenitor cell 
                    neoblast compartment has part gamma neoblast 
                    neoblast compartment has part muscle progenitor 
                    neoblast compartment has part neural progenitor 
                    neoblast compartment has part primordial germ cell 
                    neoblast compartment has part protonephridial progenitor 
                    neoblast compartment has part sigma neoblast 
                    neoblast compartment has part trail cell 
                    neoblast compartment has part zeta neoblast 
                    neoblast compartment develops from neoblast compartment 
An enclosed, cable-like bundle of axons in the peripheral nervous system originating in a nerve root in the central nervous system (or a condensed nervous structure) connecting with peripheral structures.
Expand nerve relations
                    nerve is a nervous system 
Anatomical junction where subdivisions of two or more neural trees interconnect with one another to form a network through which nerve fibers of the constituent nerve trees become regrouped; together with other nerve plexuses, nerves and ganglia, it constitutes the peripheral nervous system. Examples: cervical nerve plexus, brachial nerve plexus, sacral nerve plexus[FMA].
Expand nerve plexus relations
                    nerve plexus is a definitive tissue 
                    nerve plexus is a nervous system 
The nervous system is an organ system containing predominantly neuron and glial cells. In bilaterally symmetrical organisms, it is arranged in a network of tree-like structures connected to a central body. The main functions of the nervous system are to regulate and control body functions, and to receive sensory input, process this information, and generate behavior [CUMBO].
Expand nervous system relations
                    nervous system is a anatomical system 
                    nervous system existence overlaps asexual adult 
                    nervous system existence overlaps juvenile 
                    nervous system existence overlaps sexually mature adult 
Axon tract that crosses the midline of the central nervous system[NIF, modified]. In the context of Drosophila refers to a broad band of axons connecting equivalent neuropils each side of the brain[FBbt].
Expand nervous system commissure relations
                    nervous system commissure is a central nervous system 
A cell that is part of the nervous system.
Expand neural cell relations
                    neural cell is a electrically responsive cell 
                    neural cell is a electrically signaling cell 
Neoblasts and their differentiating daughters implicated in maintenance and regeneration of different tissues in the nervous system.
Expand neural progenitor relations
                    neural progenitor is a neoblast compartment 
                    neural progenitor is a nervous system 
                    neural progenitor is a progenitor cell 
                    neural progenitor is a stem cell 
                    neural progenitor part of neoblast compartment 
                    neural progenitor part of nervous system 
The basic cellular unit of nervous tissue. Each neuron consists of a body, an axon, and dendrites. Their purpose is to receive, conduct, and transmit impulses in the nervous system.
Expand neuron relations
                    neuron is a neural cell 
                    neuron is a terminally differentiated cell 
                    neuron part of anterior commissure 
                    neuron part of gastrodermal plexus 
                    neuron part of inner pharynx nerve plexus 
                    neuron part of lateral branches 
                    neuron part of optic chiasma 
                    neuron part of outer pharynx nerve plexus 
                    neuron part of subepidermal nerve plexus 
                    neuron part of submuscular nerve plexus 
                    neuron part of ventral nerve cord 
                    neuron develops from neural progenitor 
Cells that are in close proximity to neurons.
Expand neuron associated cell (sensu Nematoda and Protostomia) relations
                    neuron associated cell (sensu Nematoda and Protostomia) is a nervous system 
A fasciculated bundle of neuron projections (GO:0043005), largely or completely lacking synapses.
Expand neuron projection bundle relations
                    neuron projection bundle is a nervous system 
A cluster of neurites that is part of a nervous system and forms a network of dendrites and axons where synapses are present and in which neuronal somata do not occur.
Expand neuropil relations
                    neuropil is a central nervous system 
Neuronal cells which synthesize, store and release neurohormones.
Expand neurosecretory neuron relations
                    neurosecretory neuron is a neuron 
                    neurosecretory neuron is a secretory cell 
A non-material anatomical entity of two dimensions. Anatomical boundaries are contiguous structures.
Expand non-material anatomical boundary relations
                    non-material anatomical boundary is a immaterial anatomical entity 
Organized structure of distinctive morphology and function, not bounded by a lipid bilayer membrane. Includes ribosomes, the cytoskeleton and chromosomes.
Expand non-membrane-bounded organelle relations
                    non-membrane-bounded organelle is a organelle 
Any constituent part of the nucleus, a membrane-bounded organelle of eukaryotic cells in which chromosomes are housed and replicated.
Expand nuclear part relations
                    nuclear part is a nucleus 
Any of the numerous similar discrete openings in the nuclear envelope of a eukaryotic cell, where the inner and outer nuclear membranes are joined.
Expand nuclear pore relations
                    nuclear pore is a nuclear part 
A small, dense body one or more of which are present in the nucleus of eukaryotic cells. It is rich in RNA and protein, is not bounded by a limiting membrane, and is not seen during mitosis. Its prime function is the transcription of the nucleolar DNA into 45S ribosomal-precursor RNA, the processing of this RNA into 5.8S, 18S, and 28S components of ribosomal RNA, and the association of these components with 5S RNA and proteins synthesized outside the nucleolus. This association results in the formation of ribonucleoprotein precursors; these pass into the cytoplasm and mature into the 40S and 60S subunits of the ribosome.
Expand nucleolus relations
                    nucleolus is a nuclear part 
A membrane-bounded organelle of eukaryotic cells in which chromosomes are housed and replicated. In most cells, the nucleus contains all of the cell's chromosomes except the organellar chromosomes, and is the site of RNA synthesis and processing. In some species, or in specialized cell types, RNA metabolism or DNA replication may be absent.
Expand nucleus relations
                    nucleus is a intracellular membrane-bounded organelle 
                    nucleus is a membrane-bounded organelle 
Neurons that express the biogenic amine octopamine.
Expand octopaminergic neuron relations
                    octopaminergic neuron is a neurosecretory neuron 
A female germ cell that has entered meiosis.
Expand oocyte relations
                    oocyte is a female germ cell 
                    oocyte is a gamete 
                    oocyte is a ovary 
                    oocyte produced by ovary 
                    oocyte part of ovary 
An undifferentiated germ cell that proliferates rapidly and gives rise to oocytes.
Expand oogonial cell relations
                    oogonial cell is a female germ cell 
                    oogonial cell is a ovary 
                    oogonial cell is a progenitor cell 
                    oogonial cell part of ovary 
A decussation of the diencephalon where the fibers of the optic nerve cross
Expand optic chiasma relations
                    optic chiasma is a definitive tissue 
                    optic chiasma is a nervous system commissure 
                    optic chiasma is a visual system 
                    optic chiasma part of brain 
                    optic chiasma part of visual system 
A portion of the eye containing pigment cells and dendritic projections from photoreceptor neurons.
Expand optic cup relations
                    optic cup is a definitive tissue 
                    optic cup is a eye 
                    optic cup existence starts at point Stage 7 
                    optic cup part of eye 
Axis that runs between the oral and aboral poles of the spherical embryo (Stage 3 through early Stage 6). The oral pole is centered around the temporary embryonic pharynx; the aboral pole is located opposite the temporary embryonic pharynx.
Expand oral-aboral axis relations
                    oral-aboral axis is a anatomical line 
Stage 3-5 embryo hemisphere centered around the temporary embryonic pharynx.
Expand oral hemisphere relations
                    oral hemisphere subdivision of embryo 
                    oral hemisphere is a embryonic organism subdivision 
                    oral hemisphere existence ends at point Stage 6 
                    oral hemisphere existence starts at point Stage 3 
                    oral hemisphere existence overlaps Stage 3 
                    oral hemisphere existence overlaps Stage 4 
                    oral hemisphere existence overlaps Stage 5 
                    oral hemisphere existence overlaps Stage 6 
                    oral hemisphere has part blastomere compartment 
                    oral hemisphere has part embryonic gut cell 
                    oral hemisphere has part primitive gut cell 
The orifice that connects the mouth to the exterior of the body.
Expand oral opening relations
                    oral opening is a anatomical cavity 
                    oral opening existence overlaps asexual adult 
                    oral opening existence overlaps juvenile 
                    oral opening existence overlaps sexually mature adult 
                    oral opening part of mouth 
Anatomical structure that performs a specific function or group of functions.
Expand organ relations
                    organ is a multicellular anatomical structure 
Organized structure of distinctive morphology and function. Includes the nucleus, mitochondria, plastids, vacuoles, vesicles, ribosomes and the cytoskeleton, and prokaryotic structures such as anammoxosomes and pirellulosomes. Excludes the plasma membrane.
Expand organelle relations
                    organelle is a cell part 
A membrane that is one of the two lipid bilayers of an organelle envelope or the outermost membrane of single membrane bound organelle.
Expand organelle membrane relations
                    organelle membrane is a membrane 
Anatomical structure which is a subdivision of a whole organism, consisting of components of multiple anatomical systems, largely surrounded by a contiguous region of integument.
Expand organism subdivision relations
                    organism subdivision is a material anatomical entity 
A stage at which the ectoderm, endoderm, and mesoderm develop into the internal organs of the organism.
Expand organogenesis relations
                    organogenesis is a Schmidtea mediterranea developmental term 
                    organogenesis existence starts at point Stage 5 
                    organogenesis existence overlaps juvenile 
                    organogenesis existence overlaps Stage 5 
                    organogenesis existence overlaps Stage 6 
                    organogenesis existence overlaps Stage 7 
                    organogenesis existence overlaps Stage 8 
Outer most body wall muscle fibers arrayed along the anteroposterior axis. These fibers are thinner than the inner longitudinal muscle fibers.
Expand outer longitudinal muscle fiber relations
                    outer longitudinal muscle fiber is a longitudinal muscle fiber 
Pharynx muscle fibers thar run circumferentially about the pharynx and lie just beneath the outer longitudinal pharynx muscles.
Expand outer pharyngeal circular muscle fiber relations
                    outer pharyngeal circular muscle fiber is a pharyngeal circular muscle fiber 
                    outer pharyngeal circular muscle fiber immediately deep to outer pharyngeal longitudinal muscle fiber 
Heavily ciliated epidermal cells covering the outer surface of the pharynx shaft. These are \"insunk\" epidermal cells in which the nuclei reside behind the layers of longitudinal and circumferential muscles and the epithelial cell body sends out a ciliated projection to the surface to cover and encase the shaft.
Expand outer pharyngeal epithelium relations
                    outer pharyngeal epithelium is a pharyngeal epithelium 
                    outer pharyngeal epithelium part of pharyngeal epithelium 
                    outer pharyngeal epithelium immediately superficial to outer pharyngeal longitudinal muscle fiber 
Pharynx muscle fibers running anteroposterior which lie just underneath the apical, cilaited portion of the outer epithelium.
Expand outer pharyngeal longitudinal muscle fiber relations
                    outer pharyngeal longitudinal muscle fiber is a pharyngeal longitudinal muscle fiber 
                    outer pharyngeal longitudinal muscle fiber immediately superficial to outer pharyngeal circular muscle fiber 
                    outer pharyngeal longitudinal muscle fiber immediately deep to outer pharyngeal epithelium 
Ring of the pharynx nerve plexus that is proximal to the exterior surface.
Expand outer pharynx nerve plexus relations
                    outer pharynx nerve plexus is a pharynx nerve plexus 
                    outer pharynx nerve plexus part of pharynx nerve plexus 
ophis+ somatic cells (gh4-, nanos-) in the ovary that may provide trophic support to female germline stem cells and differentiating oogonia.
Expand ovarian somatic gonadal cell relations
                    ovarian somatic gonadal cell is a definitive cell type 
                    ovarian somatic gonadal cell is a ovary 
                    ovarian somatic gonadal cell part of ovary 
A gonad containing female germline stem cells which fuel oocyte production. Two ovaries are located ventally, underneath the body wall musculature, immediately posterior to the cephalic ganglia (brain) and adjacent to the ventral nerve cords. The neoblast compartment, including piwi-1+, nanos+ primordial germ cells, fuel formation of the ovaries during juvenile development.
Expand ovary relations
                    ovary is a gonad 
                    ovary is a organ 
                    ovary part of reproductive system 
                    ovary part of sexual neck 
                    ovary has part female germline stem cell 
                    ovary has part oocyte 
                    ovary has part oogonial cell 
                    ovary has part ovarian somatic gonadal cell 
Ciliated tubes adjacent to the ventral nerve cords, adjoining the tuba and the bursal canal, that transport fertilized oocytes to the genital atrium.
Expand oviduct relations
                    oviduct is a somatic reproductive system element 
                    oviduct part of copulatory region 
                    oviduct part of sexual neck 
                    oviduct part of sexual parapharyngeal region 
Ciliated epithelium lining the oviduct.
Expand oviduct epithelium relations
                    oviduct epithelium is a definitive tissue 
                    oviduct epithelium is a oviduct 
                    oviduct epithelium part of oviduct 
Anatomical space enclosed by the oviduct epithelium.
Expand oviduct lumen relations
                    oviduct lumen is a anatomical cavity 
                    oviduct lumen is a oviduct 
                    oviduct lumen part of oviduct 
A reproductive strategy in which eggs are laid, with most embryonic development occurring outside of the parent.
Expand oviparity relations
                    oviparity is a Schmidtea mediterranea developmental term 
Expand parapharnygeal pouch cavity relations
                    parapharnygeal pouch cavity is a anatomical cavity 
                    parapharnygeal pouch cavity existence overlaps asexual adult 
                    parapharnygeal pouch cavity existence overlaps juvenile 
                    parapharnygeal pouch cavity existence overlaps sexually mature adult 
                    parapharnygeal pouch cavity immediately superficial to pharynx outer epithelial surface 
The surface of the parapharyngeal pouch facing the pharynx.
Expand parapharyngeal pouch surface relations
                    parapharyngeal pouch surface is a anatomical surface 
                    parapharyngeal pouch surface existence overlaps asexual adult 
                    parapharyngeal pouch surface existence overlaps juvenile 
                    parapharyngeal pouch surface existence overlaps sexually mature adult 
                    parapharyngeal pouch surface part of pharyngeal pouch 
                    parapharyngeal pouch surface immediately superficial to parapharnygeal pouch cavity 
Region of the animal lateral to and surrounding the pharyngeal pouch.
Expand parapharyngeal region relations
                    parapharyngeal region is a definitive organism subdivision 
                    parapharyngeal region has part adhesion glands 
                    parapharyngeal region has part anterior primary gut branch 
                    parapharyngeal region has part Category 3 cell 
                    parapharyngeal region has part cavity of pharynx 
                    parapharyngeal region has part circular muscle fiber 
                    parapharyngeal region has part collecting duct 
                    parapharyngeal region has part definitive gut 
                    parapharyngeal region has part definitive pharynx 
                    parapharyngeal region has part diagonal muscle fiber 
                    parapharyngeal region has part dorsal stripe 
                    parapharyngeal region has part enteric muscle 
                    parapharyngeal region has part esophagus 
                    parapharyngeal region has part gastrodermal plexus 
                    parapharyngeal region has part gastrodermis 
                    parapharyngeal region has part inner longitudinal muscle fiber 
                    parapharyngeal region has part inner pharyngeal circular muscle fiber 
                    parapharyngeal region has part inner pharynx nerve plexus 
                    parapharyngeal region has part lumen of digestive tract 
                    parapharyngeal region has part mouth 
                    parapharyngeal region has part musculature of pharynx 
                    parapharyngeal region has part neoblast compartment 
                    parapharyngeal region has part oral opening 
                    parapharyngeal region has part outer longitudinal muscle fiber 
                    parapharyngeal region has part outer pharyngeal circular muscle fiber 
                    parapharyngeal region has part outer pharynx nerve plexus 
                    parapharyngeal region has part parapharnygeal pouch cavity 
                    parapharyngeal region has part parenchymal musculature 
                    parapharyngeal region has part pharyngeal circular muscle fiber 
                    parapharyngeal region has part pharyngeal pouch 
                    parapharyngeal region has part pharyngeal radial muscle fiber 
                    parapharyngeal region has part pharynx nerve plexus 
                    parapharyngeal region has part posterior primary gut branch 
                    parapharyngeal region has part protonephridia 
                    parapharyngeal region has part secondary gut branch 
                    parapharyngeal region has part subepidermal nerve plexus 
                    parapharyngeal region has part submuscular nerve plexus 
                    parapharyngeal region has part tertiary gut branch 
                    parapharyngeal region has part ventral nerve cord 
                    parapharyngeal region has part zeta neoblast 
                    parapharyngeal region posterior to neck 
Dorsal-ventral muscle fibers present through the mesenchyme.
Expand parenchymal musculature relations
                    parenchymal musculature is a definitive tissue 
                    parenchymal musculature is a musculature system 
                    parenchymal musculature part of copulatory region 
                    parenchymal musculature part of head 
                    parenchymal musculature part of neck 
                    parenchymal musculature part of parapharyngeal region 
                    parenchymal musculature part of tail stripe 
A rounded protuberance, connected to the seminal vesicles, responsible for transferring semen into a mating partner's bursal canal.
Expand penis papilla relations
                    penis papilla is a copulatory apparatus 
                    penis papilla is a organ 
                    penis papilla part of copulatory apparatus 
A major division of the nervous system that contains nerves which connect the central nervous system (CNS) with sensory organs, other organs, muscles, blood vessels and glands.
Expand peripheral nervous system relations
                    peripheral nervous system is a regional part of nervous system 
                    peripheral nervous system has part gastrodermal plexus 
                    peripheral nervous system has part inner pharynx nerve plexus 
                    peripheral nervous system has part outer pharynx nerve plexus 
                    peripheral nervous system has part pharynx nerve plexus 
                    peripheral nervous system has part subepidermal nerve plexus 
                    peripheral nervous system has part submuscular nerve plexus 
Any neuron that is part of a peripheral nervous system.
Expand peripheral nervous system neuron relations
                    peripheral nervous system neuron is a peripheral nervous system 
A neuron that is part of nerve found outside the central nervous system.
Expand peripheral neuron relations
                    peripheral neuron is a neuron 
Pharynx muscle fibers running parallel to the diameter of the pharynx.
Expand pharyngeal circular muscle fiber relations
                    pharyngeal circular muscle fiber is a musculature of pharynx 
                    pharyngeal circular muscle fiber is a terminally differentiated cell 
                    pharyngeal circular muscle fiber part of musculature system 
Epithelia associated with the pharynx organ.
Expand pharyngeal epithelium relations
                    pharyngeal epithelium is a definitive pharynx 
                    pharyngeal epithelium is a definitive tissue 
                    pharyngeal epithelium part of definitive pharynx 
Pharynx muscle fibers running anteroposterior (proximal to distal).
Expand pharyngeal longitudinal muscle fiber relations
                    pharyngeal longitudinal muscle fiber is a musculature of pharynx 
                    pharyngeal longitudinal muscle fiber is a terminally differentiated cell 
                    pharyngeal longitudinal muscle fiber part of musculature system 
An epithelial structure housing the definitive pharynx, connected to the esophagus and mouth.
Expand pharyngeal pouch relations
                    pharyngeal pouch is a definitive tissue 
                    pharyngeal pouch is a digestive system element 
                    pharyngeal pouch part of parapharyngeal region 
Pharynx muscle fibers that run radially, connecting the outer muscle fibers and epithelia with their inner counterparts.
Expand pharyngeal radial muscle fiber relations
                    pharyngeal radial muscle fiber is a musculature of pharynx 
                    pharyngeal radial muscle fiber is a terminally differentiated cell 
                    pharyngeal radial muscle fiber part of musculature system 
The epithelial surface lining the interior of the pharynx, facing the lumen.
Expand pharynx lumen epithelial surface relations
                    pharynx lumen epithelial surface is a anatomical surface 
                    pharynx lumen epithelial surface existence overlaps asexual adult 
                    pharynx lumen epithelial surface existence overlaps juvenile 
                    pharynx lumen epithelial surface existence overlaps sexually mature adult 
                    pharynx lumen epithelial surface part of outer pharyngeal epithelium 
Plexus of nerves located in the definitive pharynx comprised of inner and outer wall rings.
Expand pharynx nerve plexus relations
                    pharynx nerve plexus is a definitive pharynx 
                    pharynx nerve plexus is a definitive tissue 
                    pharynx nerve plexus is a peripheral nervous system 
                    pharynx nerve plexus part of definitive pharynx 
                    pharynx nerve plexus part of peripheral nervous system 
Epithelial surface covering the outside of the pharynx.
Expand pharynx outer epithelial surface relations
                    pharynx outer epithelial surface is a anatomical surface 
                    pharynx outer epithelial surface existence overlaps asexual adult 
                    pharynx outer epithelial surface existence overlaps juvenile 
                    pharynx outer epithelial surface existence overlaps sexually mature adult 
                    pharynx outer epithelial surface part of outer pharyngeal epithelium 
Bipolar photoreceptor neurons with dendritic projections into the optic cup and axons that innervate the underlying brain.
Expand photoreceptor neuron relations
                    photoreceptor neuron is a eye 
                    photoreceptor neuron is a neuron 
                    photoreceptor neuron existence starts at point Stage 7 
                    photoreceptor neuron part of eye 
Non-neuronal, pigmented cells arrayed along the proximal side of the optic cup.
Expand pigment cup cell relations
                    pigment cup cell is a optic cup 
                    pigment cup cell is a terminally differentiated cell 
                    pigment cup cell part of optic cup 
An anatomical plane that bisects a zone of weakness in an appendage. When autotomy occurs, the appendage divides along this plane.
Expand plane of autotomy relations
                    plane of autotomy is a anatomical plane 
The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins.
Expand plasma membrane relations
                    plasma membrane is a extracellular organelle 
Any constituent part of the plasma membrane, the membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins.
Expand plasma membrane part relations
                    plasma membrane part is a plasma membrane 
Position along the anteroposterior axis that is closer to the tail rather than the head.
Expand posterior relations
                    posterior is a definitive organism subdivision 
                    posterior existence overlaps asexual adult 
                    posterior existence overlaps juvenile 
                    posterior existence overlaps sexually mature adult 
                    posterior existence overlaps Stage 7 
                    posterior existence overlaps Stage 8 
Distinct posterior cluster of muscle cells located at the midline which express wnt1." [PMID:18063755] {comment="PMID:21680047}
Expand posterior pole relations
                    posterior pole is a posterior 
                    posterior pole has part muscle cell 
The primary gut branches of the triclad gut lateral and posterior to the pharynx and pharyngeal pouch.
Expand posterior primary gut branch relations
                    posterior primary gut branch is a definitive gut 
                    posterior primary gut branch is a definitive tissue 
                    posterior primary gut branch existence starts at point Stage 7 
                    posterior primary gut branch part of definitive gut 
A cell that, by division or terminal differentiation, can give rise to other cell types.
Expand precursor cell relations
                    precursor cell is a definitive cell type 
A single cell layer of extraembryonic, post-mitotic ectodermal cells bounding the embryo. The primitive ectoderm forms during Stage 2 and is thought to degenerate as the definitive epidermis forms during Stages 5-7.
Expand primitive ectoderm relations
                    primitive ectoderm is a extraembryonic structure 
                    primitive ectoderm existence starts at point Stage 2 
                    primitive ectoderm existence overlaps Stage 2 
                    primitive ectoderm existence overlaps Stage 3 
                    primitive ectoderm existence overlaps Stage 4 
                    primitive ectoderm existence overlaps Stage 5 
                    primitive ectoderm part of aboral hemisphere 
                    primitive ectoderm part of oral hemisphere 
                    primitive ectoderm develops from blastomere compartment 
Primitive ectoderm cells differentiate from the blastomere population, exit the cell cycle and interact to boud the embryo during Stage 2.
Expand primitive ectoderm cell relations
                    primitive ectoderm cell is a extraembryonic cell 
                    primitive ectoderm cell is a primitive ectoderm 
The apical surface of the single layered primitive ectoderm that is in contact with the environment.
Expand primitive ectoderm surface relations
                    primitive ectoderm surface is a anatomical surface 
                    primitive ectoderm surface is a primitive ectoderm 
Four large phagocytic cells associated with the temporary embryonic pharynx.
Expand primitive gut cell relations
                    primitive gut cell is a embryonic digestive system element 
                    primitive gut cell is a extraembryonic cell 
                    primitive gut cell existence ends at point Stage 5 
                    primitive gut cell existence starts at point Stage 3 
                    primitive gut cell existence overlaps Stage 3 
                    primitive gut cell existence overlaps Stage 4 
                    primitive gut cell existence overlaps Stage 5 
                    primitive gut cell part of embryonic digestive system 
                    primitive gut cell part of oral hemisphere 
                    primitive gut cell develops from blastomere compartment 
Neoblasts coexpressing piwi-1 and nanos that are required for male and female gonad formation. Primordial germ cells are present in both asexual and sexual adults.
Expand primordial germ cell relations
                    primordial germ cell is a germ cell 
                    primordial germ cell is a neoblast compartment 
                    primordial germ cell is a reproductive system 
                    primordial germ cell is a stem cell 
                    primordial germ cell existence starts at point Stage 6 
                    primordial germ cell part of neoblast compartment 
Primordia are populations of contiguous cells that are morphologically distinct and already correspond in extent to a later organ/tissue.
Expand primordium relations
                    primordium is a regenerating anatomical structure 
The surface of the primitive gut cells in contact with the embryonic wall.
Expand primtive gut surface relations
                    primtive gut surface is a anatomical surface 
                    primtive gut surface is a embryonic digestive system element 
                    primtive gut surface existence ends at point Stage 5 
                    primtive gut surface existence starts at point Stage 3 
                    primtive gut surface existence overlaps Stage 3 
                    primtive gut surface existence overlaps Stage 4 
                    primtive gut surface existence overlaps Stage 5 
                    primtive gut surface part of primitive gut cell 
A cycling neoblast and/or post-mitotic cell that is primed or irreversibly committed to a tissue-specific differentation program
Expand progenitor cell relations
                    progenitor cell is a precursor cell 
Excretory organs consisting of flame cells, proximal tubules, and distal tubules connected to a mesenchymal collecting duct.
Expand protonephridia relations
                    protonephridia is a organ 
                    protonephridia is a renal system 
                    protonephridia existence overlaps Stage 6 
                    protonephridia existence overlaps Stage 7 
                    protonephridia existence overlaps Stage 8 
                    protonephridia part of copulatory region 
                    protonephridia part of head 
                    protonephridia part of neck 
                    protonephridia part of parapharyngeal region 
                    protonephridia part of tail 
                    protonephridia has part distal tubule 
                    protonephridia has part flame bulb 
                    protonephridia has part proximal tubule 
                    protonephridia develops from protonephridial progenitor 
Neoblasts and post-mitotic, differentiating daughters coexpressing POU2-3, six1/2-2, Sal1, Eya and Osr, required for maintenance and regeneration of protonephridial cell types.
Expand protonephridial progenitor relations
                    protonephridial progenitor is a neoblast compartment 
                    protonephridial progenitor is a progenitor cell 
                    protonephridial progenitor is a renal system 
                    protonephridial progenitor is a stem cell 
                    protonephridial progenitor part of neoblast compartment 
Stage 2 embryo undergoing the process of sphere formation.
Expand protosphere relations
                    protosphere is a Schmidtea mediterranea developmental term 
                    protosphere produced by sphere formation 
                    protosphere existence ends at point Stage 2 
                    protosphere existence starts at point Stage 2 
                    protosphere existence overlaps Stage 2 
Ciliated epithelial cells form tubules, generating coiled, branching units terminating in flame bulbs. Tubules are formed via intercellular junctions between two epithelial cells. Proximal tubules are connected to non-ciliated distal tubules within the parenchyma.
Expand proximal tubule relations
                    proximal tubule is a definitive tissue 
                    proximal tubule is a protonephridia 
                    proximal tubule existence starts at point Stage 6 
                    proximal tubule part of protonephridia 
Axis that starts at the distal (close to the body) part of an appendage and runs to the proximal (farthest from the body) part of an appendage.
Expand proximodistal axis relations
                    proximodistal axis is a anatomical line 
An anatomical structure that is undergoing regeneration.
Expand regenerating anatomical structure relations
                    regenerating anatomical structure is a anatomical structure 
Any part or collection of parts of the central or peripheral nervous system. Parts may span both CNS and PNS.
Expand regional part of nervous system relations
                    regional part of nervous system is a nervous system 
Specialized insunk epithelial cell that is part of the adhesion gland which is responsible for production of releasing substance.
Expand releasing gland cell relations
                    releasing gland cell is a adhesion glands 
                    releasing gland cell is a terminally differentiated cell 
                    releasing gland cell existence starts at point juvenile 
                    releasing gland cell part of adhesion glands 
The renal system is an anatomical system that maintains fluid balance and contributes to electrolyte balance, acid/base balance, and disposal of nitrogenous waste products.
Expand renal system relations
                    renal system is a anatomical system 
                    renal system existence overlaps asexual adult 
                    renal system existence overlaps juvenile 
                    renal system existence overlaps sexually mature adult 
Anatomical system that has as its parts the organs concerned with reproduction.
Expand reproductive system relations
                    reproductive system is a anatomical system 
                    reproductive system existence overlaps juvenile 
                    reproductive system existence overlaps sexually mature adult 
                    reproductive system specific to sexually mature adult 
Products of the reproductive system include gametes, zygotes, yolk cells and egg capsules.
Expand reproductive system product relations
                    reproductive system product is a reproductive system 
Straight or curved rod-like structures within the epidermal cells, oriented with long axis at right angles to the epidermal surface, that are discharged into mucous secretions.
Expand rhabdite relations
                    rhabdite is a epithelial cell component 
                    rhabdite existence starts at point Stage 6 
                    rhabdite existence overlaps asexual adult 
                    rhabdite existence overlaps juvenile 
                    rhabdite existence overlaps sexually mature adult 
                    rhabdite existence overlaps Stage 6 
                    rhabdite existence overlaps Stage 7 
                    rhabdite existence overlaps Stage 8 
An intracellular organelle, about 200 A in diameter, consisting of RNA and protein. It is the site of protein biosynthesis resulting from translation of messenger RNA (mRNA). It consists of two subunits, one large and one small, each containing only protein and RNA. Both the ribosome and its subunits are characterized by their sedimentation coefficients, expressed in Svedberg units (symbol: S). Hence, the prokaryotic ribosome (70S) comprises a large (50S) subunit and a small (30S) subunit, while the eukaryotic ribosome (80S) comprises a large (60S) subunit and a small (40S) subunit. Two sites on the ribosomal large subunit are involved in translation, namely the aminoacyl site (A site) and peptidyl site (P site). Ribosomes from prokaryotes, eukaryotes, mitochondria, and chloroplasts have characteristically distinct ribosomal proteins.
Expand ribosome relations
                    ribosome is a intracellular non-membrane-bounded organelle 
                    ribosome is a non-membrane-bounded organelle 
Endoplasmic reticululum that is studded with ribosomes, leading to a \"rough\" or \"granular\" appearance.
Expand rough endoplasmic reticulum relations
                    rough endoplasmic reticulum is a endoplasmic reticulum 
A cyst of 8 interconnected spermatocytes undergoes meiosis, producing 32 haploid round spermatids. Round spermatids express protein kinase A, and undergo morphogenesis to produce mature sperm.
Expand round spermatid relations
                    round spermatid is a spermatid 
                    round spermatid develops from spermatocyte 
Anatomical plane which divides the body into right and left parts. This plane passes through the midline.
Expand sagittal plane relations
                    sagittal plane is a anatomical plane 
A stage of embryonic development defined by a unique gene expression signature, morphology and chronological time post-egg capsule deposition for hermaphrodites reared at 20C.
Expand Schmidtea mediterranea developmental stage relations
A term used to describe a developmental process during Schmidtea mediterranea embryogenesis.
Expand Schmidtea mediterranea developmental term relations
Gut branches, originating from and connected to the primary gut branches, that extend laterally towards the body edge.
Expand secondary gut branch relations
                    secondary gut branch is a definitive gut 
                    secondary gut branch is a definitive tissue 
                    secondary gut branch part of definitive gut 
A cell that specializes in controlled release of one or more substances.
Expand secretory cell relations
                    secretory cell is a terminally differentiated cell 
                    secretory cell existence overlaps asexual adult 
                    secretory cell existence overlaps juvenile 
                    secretory cell existence overlaps sexually mature adult 
The opening by which the gland cells secrete mucus to the exterior of the animal.
Expand secretory pore relations
                    secretory pore is a secretory system 
Anatomical system that has as its parts cells and glands devoted to the discharge of substances such as mucus.
Expand secretory system relations
                    secretory system is a anatomical system 
                    secretory system existence overlaps asexual adult 
                    secretory system existence overlaps juvenile 
                    secretory system existence overlaps sexually mature adult 
                    secretory system has part adhesion glands 
A cytoplasmic, membrane bound vesicle that is capable of fusing to the plasma membrane to release its contents into the extracellular space.
Expand secretory vesicle relations
                    secretory vesicle is a intracellular membrane-bounded organelle 
                    secretory vesicle is a membrane-bounded organelle 
Glandular pouches adjoining the sperm ducts which produce seminal fluid.
Expand seminal vesicle relations
                    seminal vesicle is a copulatory apparatus 
                    seminal vesicle is a definitive tissue 
                    seminal vesicle part of copulatory apparatus 
A cell that performs a sensory function.
Expand sensory cell relations
                    sensory cell is a sensory system 
                    sensory cell is a terminally differentiated cell 
                    sensory cell part of peripheral nervous system 
Any neuron having a sensory function; an afferent neuron conveying sensory impulses.
Expand sensory neuron relations
                    sensory neuron is a afferent neuron 
                    sensory neuron is a sensory cell 
Anatomical system that overlaps the nervous system and is responsible for receiving and processing sensory information.
Expand sensory system relations
                    sensory system is a anatomical system 
                    sensory system existence overlaps asexual adult 
                    sensory system existence overlaps juvenile 
                    sensory system existence overlaps sexually mature adult 
Neurons that express the neurotransmitter serotonin." [] {comment="PMID:17624455}
Expand serotonergic neuron relations
                    serotonergic neuron is a neurosecretory neuron 
A fully formed, sexually mature organism. The sexually reproducing Schmidtea mediterranea biotype exists as an obligate cross-fertilizing hermaphrodite.
Expand sexually mature adult relations
                    sexually mature adult is a Schmidtea mediterranea developmental stage 
Region of the juvenile or adult sexual biotype animal between the posterior end of the cephalic ganglia and the anterior end of the definitive pharynx.
Expand sexual neck relations
                    sexual neck is a neck 
                    sexual neck has part ovary 
                    sexual neck has part oviduct 
                    sexual neck has part oviduct epithelium 
                    sexual neck has part oviduct lumen 
                    sexual neck has part sperm duct 
                    sexual neck has part sperm duct epithelium 
                    sexual neck has part sperm duct lumen 
                    sexual neck has part testis 
                    sexual neck has part tuba 
                    sexual neck has part tuba lumen 
                    sexual neck has part vitelline gland 
Region of the sexual biotype animal lateral to and surrounding the pharyngeal pouch.
Expand sexual parapharyngeal region relations
                    sexual parapharyngeal region is a parapharyngeal region 
                    sexual parapharyngeal region existence overlaps juvenile 
                    sexual parapharyngeal region existence overlaps sexually mature adult 
                    sexual parapharyngeal region has part oviduct 
                    sexual parapharyngeal region has part oviduct epithelium 
                    sexual parapharyngeal region has part oviduct lumen 
                    sexual parapharyngeal region has part sperm duct 
                    sexual parapharyngeal region has part sperm duct epithelium 
                    sexual parapharyngeal region has part sperm duct lumen 
                    sexual parapharyngeal region has part testis 
                    sexual parapharyngeal region has part vitelline gland 
Expand sexual tail relations
                    sexual tail is a tail 
                    sexual tail has part sperm duct 
                    sexual tail has part sperm duct epithelium 
                    sexual tail has part sperm duct lumen 
                    sexual tail has part testis 
A heterogeneous subpopulation of neoblasts with enriched expression of SoxP-1 and SoxP-2 thought to contain both pluripotent stem cells and tissue-specific progenitors.
Expand sigma neoblast relations
                    sigma neoblast is a neoblast compartment 
                    sigma neoblast is a progenitor cell 
                    sigma neoblast is a stem cell 
                    sigma neoblast part of neoblast compartment 
Endoplamic reticulum that does not contain ribosomes, which synthesizes lipids, phospholipids, and steroids.
Expand smooth endoplasmic reticulum relations
                    smooth endoplasmic reticulum is a endoplasmic reticulum 
Somatic male and female accessory organs and structures of the hermaphroditic reproductive system. Somatic reproductive elements are only made in the Smed sexual biotype and form during juvenile development.
Expand somatic reproductive system element relations
                    somatic reproductive system element is a reproductive system 
                    somatic reproductive system element existence starts at point juvenile 
                    somatic reproductive system element has part bursal canal 
                    somatic reproductive system element has part cement gland 
                    somatic reproductive system element has part copulatory apparatus 
                    somatic reproductive system element has part copulatory bursa 
                    somatic reproductive system element has part gonopore 
                    somatic reproductive system element has part oviduct 
                    somatic reproductive system element has part oviduct epithelium 
                    somatic reproductive system element has part oviduct lumen 
                    somatic reproductive system element has part penis papilla 
                    somatic reproductive system element has part seminal vesicle 
                    somatic reproductive system element has part sperm duct 
                    somatic reproductive system element has part sperm duct epithelium 
                    somatic reproductive system element has part sperm duct lumen 
                    somatic reproductive system element has part tuba 
                    somatic reproductive system element has part tuba lumen 
                    somatic reproductive system element has part vitelline gland 
feature restricted to
Expand specific_to relations
A mature male germ cell that develops from a spermatid.
Expand sperm relations
                    sperm is a gamete 
                    sperm is a male germ cell 
                    sperm is a testis 
                    sperm produced by testis 
                    sperm part of testis 
A male germ cell that develops from the haploid secondary spermatocytes. Without further division, spermatids undergo structural changes and give rise to spermatozoa.
Expand spermatid relations
                    spermatid is a male germ cell 
                    spermatid is a testis 
                    spermatid part of testis 
A tektin-1+ male germ cell that develops from spermatogonia. The euploid primary spermatocytes undergo meiosis and give rise to the haploid secondary spermatocytes which in turn give rise to spermatids.
Expand spermatocyte relations
                    spermatocyte is a male germ cell 
                    spermatocyte is a testis 
                    spermatocyte part of testis 
                    spermatocyte develops from spermatogonium 
An euploid male germ cell of an early stage of spermatogenesis. In planaria, the gh4+ stem cell daughter exiting the niche undergoes three rounds of transit amplifying division with incomplete cytokinesis prior to transitioning to terminal differentiation.
Expand spermatogonium relations
                    spermatogonium is a male germ cell 
                    spermatogonium is a progenitor cell 
                    spermatogonium is a testis 
                    spermatogonium part of testis 
                    spermatogonium develops from male germline stem cell 
A network of tubes that transport sperm from the testes to the seminal vesicles. Tubes connect each testis to ducts that run along the ventral nerve cords. The ducts bifurcate immediately posterior to the pharynx, where they connect to the seminal vesicles.
Expand sperm duct relations
                    sperm duct is a definitive tissue 
                    sperm duct is a somatic reproductive system element 
                    sperm duct part of copulatory region 
                    sperm duct part of sexual neck 
                    sperm duct part of sexual parapharyngeal region 
                    sperm duct part of sexual tail 
Ciliated epithelium lining the sperm duct.
Expand sperm duct epithelium relations
                    sperm duct epithelium is a sperm duct 
                    sperm duct epithelium part of sperm duct 
Anatomical space enclosed by the sperm duct epithelium.
Expand sperm duct lumen relations
                    sperm duct lumen is a anatomical cavity 
                    sperm duct lumen is a sperm duct 
                    sperm duct lumen part of sperm duct 
Generation of a multilayered spherical embryo comprised of temporary extraembryonic tissues and undifferentiated blastomeres.
Expand sphere formation relations
                    sphere formation is a Schmidtea mediterranea developmental term 
                    sphere formation existence ends at point Stage 2 
                    sphere formation existence starts at point Stage 2 
                    sphere formation existence overlaps Stage 2 
D0-D2. Zygote and dispersed blastomere cleavage in a yolk syncytium. Days 0-2 post-egg capsule deposition at 20C.
Expand Stage 1 relations
                    Stage 1 is a embryo 
D2-D3. Sphere formation. A fraction of the blastomeres differentiate into temporary embryonic tissues that provide form and function to the embryo. Undifferentiated blastomeres remain in the embryonic wall. Days 2-3 post-egg capsule deposition at 20C.
Expand Stage 2 relations
                    Stage 2 is a embryo 
D2-D4. Dispersed blastomere cleavage in the embryonic wall of nascent spheres. Yolk ingestion into the gut cavity. Days 2-4 post-egg capsule deposition at 20C.
Expand Stage 3 relations
                    Stage 3 is a embryo 
D3-D5. Dispersed blastomere cleavage in the embryonic wall. Yolk ingestion into the gut cavity. Early embryonic gut formation. Days 3-5 post-egg capsule deposition at 20C.
Expand Stage 4 relations
                    Stage 4 is a embryo 
D5-D7. Organogenesis onset. Downregulation of early embryo enriched transcripts and birth of adult lineages within the blastomere population. Early embryonic gut formation continues. Yolk ingestion into the gut cavity. Days 5-7 post-egg capsule deposition at 20C.
Expand Stage 5 relations
                    Stage 5 is a embryo 
D7-D9. Organogenesis and morphogenesis. Definitive organ formation. Temporary embryonic cell types degenerate. Embryo elongation. Days 7-9 post-egg capsule deposition at 20C.
Expand Stage 6 relations
                    Stage 6 is a embryo 
D9-D11. Organogenesis and organ maturation continues. Embryos elongated. Eyes just visible. Onset of gliding motility. Days 9-11 post-egg capsule deposition at 20C.
Expand Stage 7 relations
                    Stage 7 is a embryo 
D13-D15. Organogenesis and organ maturation continues. Hatching. Days 13-15 post-egg capsule deposition at 20C.
Expand Stage 8 relations
                    Stage 8 is a embryo 
A relatively undifferentiated cell that retains the ability to divide and proliferate throughout life to provide progenitor cells that can differentiate into specialized cells.
Expand stem cell relations
                    stem cell is a definitive cell type 
Plexus of nerves located just between the definitive epidermis and the body wall musculature.
Expand subepidermal nerve plexus relations
                    subepidermal nerve plexus is a nerve plexus 
                    subepidermal nerve plexus is a peripheral nervous system 
                    subepidermal nerve plexus part of copulatory region 
                    subepidermal nerve plexus part of head 
                    subepidermal nerve plexus part of neck 
                    subepidermal nerve plexus part of parapharyngeal region 
                    subepidermal nerve plexus part of peripheral nervous system 
                    subepidermal nerve plexus part of tail 
Plexus of nerves that innervate the body wall muscles.
Expand submuscular nerve plexus relations
                    submuscular nerve plexus is a nerve plexus 
                    submuscular nerve plexus is a peripheral nervous system 
                    submuscular nerve plexus part of copulatory region 
                    submuscular nerve plexus part of head 
                    submuscular nerve plexus part of neck 
                    submuscular nerve plexus part of parapharyngeal region 
                    submuscular nerve plexus part of peripheral nervous system 
                    submuscular nerve plexus part of tail 
Sympathetic neurons are part of the sympathetic nervous system and are primarily adrenergic producing the neurotransmitter noradrenalin along with other neuropeptides.
Expand sympathetic neuron relations
                    sympathetic neuron is a neuron 
Fused yolk cells surrounding blastomeres undergoing dispersed cleavage during Stages 1 and 2.
Expand syncytial yolk cell relations
                    syncytial yolk cell is a extraembryonic cell 
                    syncytial yolk cell produced by vitelline gland 
                    syncytial yolk cell existence ends at point Stage 2 
                    syncytial yolk cell existence starts at point Stage 1 
                    syncytial yolk cell existence overlaps Stage 1 
                    syncytial yolk cell existence overlaps Stage 2 
Caudal region, beginning at the mouth and ending at posterior pole.
Expand tail relations
                    tail is a posterior 
                    tail has part adhesion glands 
                    tail has part Category 2 cell 
                    tail has part Category 3 cell 
                    tail has part circular muscle fiber 
                    tail has part collecting duct 
                    tail has part definitive gut 
                    tail has part diagonal muscle fiber 
                    tail has part dorsal stripe 
                    tail has part enteric muscle 
                    tail has part enteric neuron 
                    tail has part flame cell 
                    tail has part gastrodermal plexus 
                    tail has part gastrodermis 
                    tail has part goblet cell 
                    tail has part inner longitudinal muscle fiber 
                    tail has part intestinal phagocyte 
                    tail has part lumen of digestive tract 
                    tail has part muscle progenitor 
                    tail has part neoblast compartment 
                    tail has part outer longitudinal muscle fiber 
                    tail has part parenchymal musculature 
                    tail has part posterior primary gut branch 
                    tail has part protonephridia 
                    tail has part secondary gut branch 
                    tail has part subepidermal nerve plexus 
                    tail has part submuscular nerve plexus 
                    tail has part tertiary gut branch 
                    tail has part ventral nerve cord 
                    tail has part zeta neoblast 
                    tail posterior to asexual parapharyngeal region 
                    tail posterior to copulatory region 
Medial region of the tail; the parenchymal space between the posterior primary gut branches.
Expand tail stripe relations
                    tail stripe is a tail 
                    tail stripe part of tail 
An innervated, muscular pump that ingests yolk cells into the gut cavity. The temporary embryonic pharynx is an extraembryonic tissue that forms during Stage 2, functions during Stages 3-5, and degenerates during Stages 6-7.
Expand temporary embryonic pharynx relations
                    temporary embryonic pharynx is a embryonic digestive system element 
                    temporary embryonic pharynx existence ends at point Stage 6 
                    temporary embryonic pharynx existence starts at point Stage 2 
                    temporary embryonic pharynx existence overlaps Stage 2 
                    temporary embryonic pharynx existence overlaps Stage 3 
                    temporary embryonic pharynx existence overlaps Stage 4 
                    temporary embryonic pharynx existence overlaps Stage 5 
                    temporary embryonic pharynx existence overlaps Stage 6 
                    temporary embryonic pharynx part of oral hemisphere 
                    temporary embryonic pharynx has part muscle cell 
                    temporary embryonic pharynx develops from blastomere compartment 
Differentiated muscle cell present in a circular muscle fiber of the temporary embryonic pharynx.
Expand temporary embryonic pharynx circular muscle cell relations
                    temporary embryonic pharynx circular muscle cell is a extraembryonic cell 
                    temporary embryonic pharynx circular muscle cell is a temporary embryonic pharynx circular muscle fiber 
A muscle fiber that encircles the luminal opening of the temporary embryonic pharynx.
Expand temporary embryonic pharynx circular muscle fiber relations
                    temporary embryonic pharynx circular muscle fiber is a temporary embryonic pharynx 
foxA1+ epithelial cell contained in the temporary embryonic pharynx.
Expand temporary embryonic pharynx epithelial cell relations
                    temporary embryonic pharynx epithelial cell is a extraembryonic cell 
                    temporary embryonic pharynx epithelial cell is a temporary embryonic pharynx 
The epithelial surface lining the interior of the temporary embryonic pharynx, facing the lumen.
Expand temporary embryonic pharynx lumen epithelial surface relations
                    temporary embryonic pharynx lumen epithelial surface is a anatomical surface 
                    temporary embryonic pharynx lumen epithelial surface is a temporary embryonic pharynx 
A neuronal cell innervating the temporary embryonic pharynx. Four neurons innervate the radial muscle fibers that ring the oral opening.
Expand temporary embryonic pharynx neuronal cell relations
                    temporary embryonic pharynx neuronal cell is a extraembryonic cell 
                    temporary embryonic pharynx neuronal cell is a temporary embryonic pharynx 
Differentiated radial muscle cell present in the temporary embryonic pharynx.
Expand temporary embryonic pharynx radial muscle cell relations
                    temporary embryonic pharynx radial muscle cell is a extraembryonic cell 
                    temporary embryonic pharynx radial muscle cell is a temporary embryonic pharynx radial muscle fiber 
A muscle fiber that connects and runs perpendicular to a circular muscle fiber surrounding the luminal opening of the temporary embryonic pharynx.
Expand temporary embryonic pharynx radial muscle fiber relations
                    temporary embryonic pharynx radial muscle fiber is a temporary embryonic pharynx 
A post-mitotic, terminally differentiated cell type found in planarian embryos, juveniles and/or adult animals.
Expand terminally differentiated cell relations
                    terminally differentiated cell is a definitive cell type 
Gut branches originating from and connected to the secondary gut branches.
Expand tertiary gut branch relations
                    tertiary gut branch is a definitive gut 
                    tertiary gut branch is a definitive tissue 
                    tertiary gut branch part of definitive gut 
A gonad containing male germline stem cells which fuel sperm production. Testes are located dorsolaterally, and are excluded from the head. The neoblast compartment, including piwi-1+, nanos+ primordial germ cells, fuels formation of testes during juvenile development and regeneration.
Expand testis relations
                    testis is a gonad 
                    testis is a organ 
                    testis part of copulatory region 
                    testis part of sexual neck 
                    testis part of sexual parapharyngeal region 
                    testis part of sexual tail 
                    testis has part elongate spermatid 
                    testis has part male germline stem cell 
                    testis has part round spermatid 
                    testis has part sperm 
                    testis has part spermatid 
                    testis has part spermatocyte 
                    testis has part spermatogonium 
                    testis has part testis somatic gonadal cell 
dmd-1+ expressing somatic cells within the testis that promote male GSC maintenance. dmd-1+, ophis-1+ somatic gonadal cells ensheath germ cells via long cytoplasmic processes and promote differentiation.
Expand testis somatic gonadal cell relations
                    testis somatic gonadal cell is a definitive cell type 
                    testis somatic gonadal cell is a testis 
                    testis somatic gonadal cell part of testis 
Multicellular anatomical structure that consists of many cells of one or a few types, arranged in an extracellular matrix such that their long-range organisation is at least partly a repetition of their short-range organisation.
Expand tissue relations
                    tissue is a multicellular anatomical structure 
The process in which the anatomical structures of a tissue are generated and organized.
Expand tissue morphogenesis relations
                    tissue morphogenesis is a Schmidtea mediterranea developmental term 
                    tissue morphogenesis existence starts at point Stage 6 
                    tissue morphogenesis existence overlaps Stage 6 
                    tissue morphogenesis existence overlaps Stage 7 
                    tissue morphogenesis existence overlaps Stage 8 
Ovo+ neoblasts and post-mitotic eye progenitors that simultaneously migrate and differentiate into photoreceptor neurons and non-neuronal pigment cup cells comprising the optic cup.
Expand trail cell relations
                    trail cell is a neoblast compartment 
                    trail cell is a progenitor cell 
                    trail cell is a stem cell 
                    trail cell is a visual system 
                    trail cell existence starts at point Stage 6 
                    trail cell part of neoblast compartment 
                    trail cell part of visual system 
Anatomical plane which divides the body into superior and inferior parts. It always contains the midline and is perpendicular to the coronal and sagittal planes. It is also known as the horizontal plane, axial plane, or transaxial plane.
Expand transverse plane relations
                    transverse plane is a anatomical plane 
A sperm storage organ located immediately posterior to the ovary, at the anterior end of the oviduct. Oocytes exiting the ovary are fertilized in the tuba as they enter the oviduct.
Expand tuba relations
                    tuba is a definitive tissue 
                    tuba is a somatic reproductive system element 
                    tuba part of sexual neck 
Anatomical space enclosed by tuba. Oocyte(s) are fertilized in the tuba lumen by sperm that traveled up the oviduct.
Expand tuba lumen relations
                    tuba lumen is a anatomical cavity 
                    tuba lumen is a tuba 
                    tuba lumen part of tuba 
Neuron with one neurite that extends from the cell body.
Expand unipolar neuron relations
                    unipolar neuron is a sensory neuron 
A closed structure, found only in eukaryotic cells, that is completely surrounded by unit membrane and contains liquid material. Cells contain one or several vacuoles, that may have different functions from each other. Vacuoles have a diverse array of functions. They can act as a storage organelle for nutrients or waste products, as a degradative compartment, as a cost-effective way of increasing cell size, and as a homeostatic regulator controlling both turgor pressure and pH of the cytosol.
Expand vacuole relations
                    vacuole is a cytoplasmic part 
Position along the dorsoventral axis that is below the anteroposterior axis, or closer to the belly.
Expand ventral relations
                    ventral is a definitive organism subdivision 
                    ventral existence overlaps asexual adult 
                    ventral existence overlaps juvenile 
                    ventral existence overlaps sexually mature adult 
                    ventral existence overlaps Stage 7 
                    ventral existence overlaps Stage 8 
                    ventral has part cephalic ganglia 
                    ventral has part gonopore 
                    ventral has part lateral branches 
                    ventral has part mouth 
                    ventral has part neuropil 
                    ventral has part ovary 
                    ventral has part oviduct 
                    ventral has part tuba 
                    ventral has part ventral epidermis 
                    ventral has part ventral nerve cord 
Single cell layer of ventral, post-mitotic, heavily ciliated epithelial cells
Expand ventral epidermis relations
                    ventral epidermis is a definitive epidermis 
                    ventral epidermis part of head 
                    ventral epidermis part of tail 
The pair of closely united ventral longitudinal nerves with their segmental ganglia that is characteristic of many elongate invertebrates (as earthworms)[BTO]. A large process bundle that runs along the vental mid-line extending from the ventral region of the nerve ring[WB]. The ventral cord is one of the distinguishing traits of the central nervous system of all arthropods (such as insects, crustaceans and arachnids) as well as many other invertebrates, such as the annelid worms[GO].
Expand ventral nerve cord relations
                    ventral nerve cord is a central nervous system 
                    ventral nerve cord existence overlaps Stage 7 
                    ventral nerve cord existence overlaps Stage 8 
                    ventral nerve cord part of copulatory region 
                    ventral nerve cord part of head 
                    ventral nerve cord part of neck 
                    ventral nerve cord part of parapharyngeal region 
                    ventral nerve cord part of tail 
A specialized insunk epithelial cell that is part of the adhesion glands which is responsible for production and excretion of the viscid substance allowing adherence to a substrate.
Expand viscid gland cell relations
                    viscid gland cell is a adhesion glands 
                    viscid gland cell is a terminally differentiated cell 
                    viscid gland cell part of adhesion glands 
The sensory system subserving the sense of vision.
Expand visual system relations
                    visual system is a anatomical system 
                    visual system existence overlaps asexual adult 
                    visual system existence overlaps juvenile 
                    visual system existence overlaps sexually mature adult 
Glands surrounding the oviducts which produce yolk cells. Yolk cells deposited into the oviducts travel to the genital atrium where they are packaged, along with one or more zygotes, into developing egg capsules.
Expand vitelline gland relations
                    vitelline gland is a definitive tissue 
                    vitelline gland is a somatic reproductive system element 
                    vitelline gland produces yolk cell 
                    vitelline gland part of copulatory region 
                    vitelline gland part of sexual neck 
                    vitelline gland part of sexual parapharyngeal region 
An extraembryonic cell, produced by somatic vitellogenic glands in adult hermaphrodites, that provides nutrition to the developing embryo.
Expand yolk cell relations
                    yolk cell is a reproductive system product 
                    yolk cell is a terminally differentiated cell 
                    yolk cell produced by vitelline gland 
                    yolk cell existence starts at point juvenile 
                    yolk cell part of embryonic wall 
An abundant neoblast subclass consisting of p53+, zfp1+ progenitors required for maintenance and regeneration of epidermal cell type(s).
Expand zeta neoblast relations
                    zeta neoblast is a epidermal progenitor 
                    zeta neoblast is a neoblast compartment 
                    zeta neoblast is a stem cell 
                    zeta neoblast part of neoblast compartment 
Diploid cell produced by the fusion of sperm cell nucleus and egg cell.
Expand zygote relations
                    zygote is a Stage 1 
                    zygote existence ends at point Stage 1 
                    zygote existence starts at point Stage 1