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- - The rostral end of the neural tube undergoes a series of regional expansions to generate the final form of the brain. In early development (3-4 weeks) there are three primary vesicles:

- - - - - 1. Forebrain = Prosencephalon
- - - - - 2. Midbrain = Mesencephalon
- - - - - 3. Hindbrain = Rhombencephalon