midbrain

noun
mid·​brain | \ ˈmid-ˌbrān How to pronounce midbrain (audio) \

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 The good news is that even the midbrain can be trained and conditioned for constructive and creative, rather than destructive, responses. Rajni Bakshi, Quartz India, "If we are naturally violent, why do armies spend so much on training to kill?," 1 Oct. 2019 The study found that the players had lower measures of fractional anisotropy in their right midbrains, which is a part of the brain stem. Fox News, "Routine football collisions could damage players' brains, researchers say," 13 Aug. 2019 The researchers looked specifically at the midbrain, a region on the brain stem that governs primitive, thoughtless functions such as hearing and temperature regulation. Eva Frederick, Science | AAAS, "Just one season of playing football—even without a concussion—can cause brain damage," 7 Aug. 2019 Although only two of the 38 players received a concussion, more than two-thirds of them showed changes to the integrity of the white matter of their midbrains. Eva Frederick, Science | AAAS, "Just one season of playing football—even without a concussion—can cause brain damage," 7 Aug. 2019 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.

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First Known Use of midbrain

1864, in the meaning defined above

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Time Traveler for midbrain

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The first known use of midbrain was in 1864

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Cite this Entry

“Midbrain.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/midbrain. Accessed 20 Feb. 2020.

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More Definitions for midbrain

midbrain

noun
mid·​brain | \ ˈmid-ˌbrān How to pronounce midbrain (audio) \

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

Rhyming Dictionary: Words that rhyme with midbrain

Britannica.com: Encyclopedia article about midbrain

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