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Divisions of the embryonic brain

(Left) The three-vesicle stage comprised, from rostral to causal, of the prosencephalon (forebrain), mesencephalon (midbrain), and rhombencephalon (hindbrain). (Right) The five-vesicle stage, in which the prosencephalon has divided into a cleaved telencephalon and the diencephalon. (Source: Nrets. Creative Commons Attribution-Share Alike 2.5 Generic License, https://creativecommons.org/licenses/by-sa/2.5/deed.en.)

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