Yours, Etc.: Origins and Uses of 8 Sign-Offs
prosencephalon pros·en·ceph·a·lon (prŏs'ěn-sěf'ə-lŏn')
The most anterior of the three primary regions of the embryonic brain, from which the telencephalon and diencephalon develop.
The segment of the adult brain that develops from the embryonic forebrain and includes the cerebrum, thalamus, and hypothalamus.