optic chiasma

The Planarian Anatomoy Ontology (PLANA) is a collection of terms curated from the literature and other organism anatomy ontologies to describe anatomical features, life cycle stages and developmental processes in the regenerative flatworm Schmidtea mediterranea. The latest version of the PLANA Ontology is available through the Open Biological and Biomedical Ontology Foundry (OBO) . PLANA Ontology terms are searchable at the EMBL-EBI Ontology Lookup Service (OLS) and the PLANA Ontology Terms Page.

The Overview Section is populated with infomration from the OLS.




Planarian Anatomy Ontology Term Overview


NAME:

  optic chiasma


DEFINITON:

  A decussation of the diencephalon where the fibers of the optic nerve cross


TERM DEFINITION CITATIONS:

  PMID:18466009


TERM CITATIONS:

  PMID:18466009

TERM ID:

  PLANA:0000459


SYNONYMS:

  chiasma opticum, optic chiasm, decussation of optic nerve fibers, chiasma nervorum opticorum, chiasma, optic chiasm (Rufus of Ephesus)


ABOUT THIS TERM:

  optic chiasma "is a" definitive tissue

  optic chiasma "contained in" anterior compartment and head

  optic chiasma "existence overlaps" juvenile, asexual adult and sexually mature adult

  optic chiasma "part of" central nervous system and visual system


  commissural neuron "is a" optic chiasma


HOMOLOGY NOTES:

  • The chiasm has been studied in great detail in some animals, while in others relatively little or nothing is known. Although there are some gross architectural features that are conserved within some animals, such as birds and fish, the general picture is one of diversity. This review will attempt to consider the key features of such diversity of chiasmatic organisation in vertebrates and the mechanisms that sculpt them from the limited literature that is available. However, as so much research has been undertaken on the structure and development of the chiasm in laboratory animals, any review must consider the information that has been gleaned from them and hope that future studies will determine whether the features revealed in these animals, and the underlying mechanisms that generate them, have a common vertebrate plan.[uncertain][VHOG]

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Planarian Anatomy Ontology


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