cerebral vesicle n.
Any of the three divisions of the early embryonic brain: prosencephalon, mesencephalon, and rhombencephalon. Also called encephalic vesicle, primary brain vesicle.
The cerebral vesicle which represents this is a plain cavity without true subdivision into ventricles.
Into this the cerebral vesicle of the larval lancelet opens.
This plate reaches forward below the third cerebral vesicle as far as the infundibulum.