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- - - - - By the fifth week of development the lateral wall of the prosencephalon has pushed outward in a blister-like manner, carrying the cental cavity with it to form a new space called the lateral ventricle. The part of the cavity that remains behind, in the mid-line, becomes the third ventricle. There is also a less than obvious subdivision of the space within the rhomencephalon, forming the rostral and caudal parts of the fourth ventricle.
- - - - -Thus, we now have 5 cavities within the brain:

1) The lateral ventricle
2) The third ventricle
3) The cerebral aqueduct
4) The rostral fourth ventricle
5) The caudal fourth ventricle

- - - - - These spaces will form the ventricular system of the brain, and as we shall see in the next view, the tissue that is the wall of each space becomes a major subdivision of the adult brain.