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or brain stem

[breyn-stem] /ˈbreɪnˌstɛm/
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.
Origin of brainstem
First recorded in 1875-80; brain + stem1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for brain stem
Historical Examples
  • These are three in number, named the cerebrum, the cerebellum, and the brain stem.

    Physiology Ernest G. Martin
  • These are a few of the centers which are present in the brain stem.

    Physiology Ernest G. Martin
  • We have a center in the brain stem from which the nervous discharges come.

    Physiology Ernest G. Martin
  • The brain stem is really the upper extension of the spinal cord within the head.

    Physiology Ernest G. Martin
  • The brain stem has a special function of its own in connection with the control of what are often called the vital processes.

    Physiology Ernest G. Martin
  • In the brain stem are located groups of nerve cells to which are given the name of centers.

    Physiology Ernest G. Martin
  • Both these sets of nerves arise from centers in the brain stem, and both these centers appear to be discharging continuously.

    Physiology Ernest G. Martin
  • When this warm blood enters the brain stem it arouses the sweat center and an increased secretion of sweat results.

    Physiology Ernest G. Martin
  • There's a place in the brain stem called the isthmus, no cell masses, just bundles of fibers running up and down.

  • The kind of joint to be used having been hit upon, the next point was to secure a safe passage for the brain stem.

    A Book of Exposition Homer Heath Nugent
British Dictionary definitions for brain stem


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 Medicine

brain stem or brainstem
The portion of the brain, consisting of the medulla oblongata, pons Varolii, and mesencephalon, that connects the spinal cord to the forebrain and cerebrum.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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brain stem in Science
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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