Definition of mesencephalon in English:

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mesencephalon

Pronunciation: /ˌmɛsɛnˈsɛf(ə)lɒn/
/ˌmiːzɛnˈsɛf(ə)lɒn/ /ˌmɛsɛnˈkɛf(ə)lɒn/ /ˌmiːzɛnˈkɛf(ə)lɒn/

noun

Anatomy
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.’

Derivatives

mesencephalic

adjective
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.

Origin

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

For editors and proofreaders

Line breaks: mes|en¦ceph|alon

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