midbrain

noun
mid·brain | \ˈmid-ˌbrān \

Definition of midbrain 

: the middle of the three primary divisions of the developing vertebrate brain or the corresponding part of the adult brain between the forebrain and hindbrain that includes the tectum, tegmentum, and substantia nigra

called also mesencephalon

— see brain illustration

Examples of midbrain in a Sentence

Recent Examples on the Web

Characterized by muscle stiffness and tremors, Parkinson's is caused by the death of dopamine-producing neurons in a section of the midbrain. Ferris Jabr, Scientific American, "How the Brain Gets Addicted to Gambling," 14 May 2018 One set of axons projected to the periacqueductal gray in the midbrain, an area involved in motor behaviors. Lydia Denworth, Scientific American, "A Command Center in the Mammalian Brain Orchestrates Parenting Behaviors," 11 Apr. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'midbrain.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of midbrain

1864, in the meaning defined above

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The first known use of midbrain was in 1864

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More Definitions for midbrain

midbrain

noun
mid·brain | \ˈmid-ˌbrān \

Medical Definition of midbrain 

: the middle division of the three primary divisions of the developing vertebrate brain or the corresponding part of the adult brain that includes a ventral part containing the cerebral peduncles and a dorsal tectum containing the corpora quadrigemina and that surrounds the aqueduct of Sylvius connecting the third and fourth ventricles

called also mesencephalon

More from Merriam-Webster on midbrain

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Britannica.com: Encyclopedia article about midbrain

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