Template:Embryonic Ventricular Timeline table

Human Embryonic Ventricular Timeline

Week	Carnegie Stage	Event
Week 4	11	appearance of the optic ventricle. The neural groove/tube space is initially filled with amniotic fluid.
	12	closure of the caudal neuropore, onset of the ventricular system and separates the ependymal from the amniotic fluid.
	13	cavity of the telencephalon medium is visible.
Week 5	14	cerebral hemispheres and lateral ventricles begin, rhomboid fossa becomes apparent.
	15	medial and lateral ventricular eminences cause indentations in the lateral ventricle
Week 6	16	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.
Week 7	18	areae membranaceae rostralis and caudalis are visible in the roof of the fourth ventricle, and the paraphysis is appearing.
	19	choroid villi are visible in the fourth ventricle, and a mesencephalic evagination (blindsack) is visible
Week 8	20	choroid villi are visible in the lateral ventricle.
	21	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).
Week: 1 2 3 4 5 6 7 8 Carnegie stage: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
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