1-Stop Dictionary Reference

Mesencephalon

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The American Heritage® Dictionary of the English Language, 4th Edition

n. The midbrain.

Wiktionary, Creative Commons Attribution/Share-Alike License

n. A part of the brain located rostral to the pons and caudal to the thalamus and the basal ganglia, composed of the tectum (dorsal portion) and the tegmentum (ventral portion).

the GNU version of the Collaborative International Dictionary of English

n. The middle segment of the brain; the midbrain. Sometimes abbreviated to mesen. See brain.

The Century Dictionary and Cyclopedia

n. The midbrain; a segment of the encephalon consisting essentially of the corpora quadrigemina or optic lobes and the crura cerebri. See brain. Also mesencephal, mesocephalon.

WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

n. the middle portion of the brain

Word Usage

"For reasons of its own, evolution allowed mammalian energy to hold sway, and the recently developed human midbrain or mesencephalon, which had folded over the old diencephalon, could be accurately labeled a mammal brain."

Hypernym

Words that are more generic or abstract

neural structure

Cross Reference

tegmentum tectum

Variant

mesen brain

Synonym

Words with the same meaning

midbrain