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).
|
|
Links: ventricular | neural | timeline | Category:Timeline Table Data Reference[1]
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