Template:Embryonic Ventricular Timeline table

Human Embryonic Ventricular Timeline

Stage 11 - appearance of the optic ventricle. The neural groove/tube space is initially filled with amniotic fluid. Stage 12 - closure of the caudal neuropore, onset of the ventricular system and separates the ependymal from the amniotic fluid. Stage 13 - cavity of the telencephalon medium is visible. Stage 14 - cerebral hemispheres and lateral ventricles begin, rhomboid fossa becomes apparent. Stage 15 - medial and lateral ventricular eminences cause indentations in the lateral ventricle Stage 16 - hypothalamic sulcus is evident. Stages 17-18 - interventricular foramina are becoming relatively smaller, and cellular accumulations indicate the future choroid villi of the fourth and lateral ventricles. Stage 18 - areae membranaceae rostralis and caudalis are visible in the roof of the fourth ventricle, and the paraphysis is appearing. Stage 19 - choroid villi are visible in the fourth ventricle, and a mesencephalic evagination (blindsack) is visible Stage 20 - choroid villi are visible in the lateral ventricle. Stage 21 - olfactory ventricle is visible. Stages 21-23 - lateral ventricle has become C-shaped (anterior and inferior horns visible). Recesses develop in the third ventricle (optic, infundibular, pineal). Data from O'Rahilly and Müller (1990)