| midbrain | <anatomy, neurology> The part of the brain above the pons and below the thalamus, it is the uppermost part of the brainstem, and is involved in basic, unconscious body function. (09 Oct 1997) |
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| midbrain tegmentum | That major part of the substance of the mesencephalon or midbrain that extends from the substantia nigra to the level of the cerebral aqueduct. Synonym: tegmentum mesencephali, tegmentum, midbrain tegmentum. (05 Mar 2000) |
| midbrain vesicle | <anatomy> The middle segment of the brain; the midbrain. Sometimes abbreviated to mesen. See Brain. Origin: NL. See Meso- and Encephalon. Source: Websters Dictionary (01 Mar 1998) |