digestive system development

Left to right: Illustrations of stage (S) S2 through S8 embryos. Embryonic gut (purple), temporary embryonic pharynx (yellow), definitive gut (red), definitive pharynx (green). S3-S5: aboral hemisphere (left), oral hemisphere (right). S6-S8: dorsal view (left), ventral view (right).

Illustrations by Mark M. Miller.