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brainstem

American  
[breyn-stem] / ˈbreɪnˌstɛm /
Or brain stem

noun

  1. the portion of the brain that is continuous with the spinal cord and comprises the medulla oblongata, pons, midbrain, and parts of the hypothalamus, functioning in the control of reflexes and such essential internal mechanisms as respiration and heartbeat.

brainstem British  
/ ˈbreɪnˌstɛm /

noun

  1. the stalklike part of the brain consisting of the medulla oblongata, the midbrain, and the pons Varolii

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
brainstem Scientific  
/ brān′stĕm′ /

  1. The part of the vertebrate brain located at the base of the brain and made up of the medulla oblongata, pons, and midbrain. The brainstem controls and regulates vital body functions, including respiration, heart rate, and blood pressure.

  2. See also reticular formation

Etymology

Origin of brainstem

First recorded in 1875–80; brain + stem 1

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.