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