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diencephalon
(di″әn-sef´ә-lon)
the posterior part of the prosencephalon, consisting of the hypothalamus, thalamus, metathalamus, and epithalamus; the subthalamus is often considered to be a distinct
division. See also brainstem.
Diencephalon. Posterior (dorsal) (A) and anterior (inferior) (B) views of the base of the brain, showing the diencephalon in relation to the mesencephalon (midbrain) and rhombencephalon
(hindbrain).
the posterior of the two brain vesicles formed by specialization of the prosencephalon in the developing embryo.

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