mesencephalon

noun, plural mes·en·ceph·a·la [mes-en-sef–uh-luh, mez-] /ˌmɛs ɛnˈsɛf ə lə, ˌmɛz-/, mes·en·ceph·a·lons.

1. Anatomy. the midbrain.

noun

1. the part of the brain that develops from the middle portion of the embryonic neural tubeNontechnical name: midbrain Compare prosencephalon, rhombencephalon

n.

1. The portion of the vertebrate brain that develops from the middle section of the embryonic brain.midbrain