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mesencephalon Line breaks: mes|en¦ceph|alon
Pronunciation: /ˌmɛsɛnˈsɛf(ə)lɒn/
/ˌmiːzɛnˈsɛf(ə)lɒn/ /ˌmɛsɛnˈkɛf(ə)lɒn/ /ˌmiːzɛnˈkɛf(ə)lɒn/

Definition of mesencephalon in English:


Another term for midbrain.
Example sentences
  • The latter includes the diencephalon; mesencephalon, or midbrain; pons; and medulla oblongata.
  • The neural tube is broad and divides flaccidly into three parts: an anterior prosencephalon, a middle mesencephalon, and a posterior rhombencephalon.
  • Continuing in the vocabulary vein, the ‘neuraxis’ is ‘the axial unpaired part of the central nervous system, composed of the spinal cord, rhombencephalon, mesencephalon, and diencephalon.’


Example sentences
  • Two non-sensory control regions were examined, the optic tectum and the mesencephalic tegmentum.
  • The root fibers arising from the trochlear nuclei form a decussation dorsal to the mesencephalic aqueduct, and they are the only cranial nerves that cross completely and that leave the dorsal aspect of the brain stem.
  • The principal mesencephalic projection to the striatum originates from the substantia nigra pars compacta.


Mid 19th century: from Greek mesos 'middle' + encephalon.

Definition of mesencephalon in:
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