mesencephalon /mes·en·ceph·a·lon/ (mez″-en-sef´ah-lon) midbrain.
mesencephalon
1. the part of the brain developed from the middle of the three primary vesicles of the embryonic neural tube, comprising the tectum and the cerebral peduncles.
2. the middle of the three primary brain vesicles in the embryo, lying between the prosencephalon and the rhombencephalon.mesencephal´ic
mes·en·ceph·a·lon (m z n-sf  -l n)n. The portion of the vertebrate brain that develops from the middle section of the embryonic brain. Also called midbrain. |
mesencephalon
[mes′ensef′əlon]
Etymology: Gk, mesos, middle, enkephalos, brain
one of the three parts of the brainstem, lying just below the cerebrum and just above the pons. It consists primarily of white substance with some gray substance around the cerebral aqueduct. Deep within the mesencephalon are nuclei of the third and the fourth cranial nerves and the anterior part of the fifth cranial nerve. The mesencephalon also contains nuclei for certain auditory and visual reflexes. Also called midbrain. mesencephalic [mes′ensifal′ik] , adj.
mesencephalon
1. the midbrain, including the colliculi of the tectum, the cerebral crura, the Edinger-Westphal nucleus, internal capsule, lemniscal trigone, pallidum, putamen and substantia nigra.
2. the middle of the three primary brain vesicles of the embryo. See also midbrain syndrome.
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