Final answer:
The three primary vesicles of the neural tube are the prosencephalon (forebrain), mesencephalon (midbrain), and rhombencephalon (hindbrain).
Step-by-step explanation:
The neural tube forms three primary vesicles during early embryonic development that give rise to various regions of the brain. These three primary vesicles are the prosencephalon (forebrain), mesencephalon (midbrain), and rhombencephalon (hindbrain). As development progresses, these primary vesicles will undergo further differentiation and enlargement, eventually leading to the formation of the adult brain structures.