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brainstem

[breyn-stem] /ˈbreɪnˌstɛm/
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.
Also, brain stem.
Origin
1875-1880
1875-80; brain + stem1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for brain-stem

brainstem

/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
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brain-stem in Science
brainstem
  (brān'stěm')   
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. See also reticular formation.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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