brain-stem

brainstem

[breyn-stem]
noun
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:
1875–80; brain + stem1

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Collins
World English Dictionary
brainstem (ˈbreɪnˌstɛm)
 
n
the stalklike part of the brain consisting of the medulla oblongata, the midbrain, and the pons Varolii

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American Heritage
Science Dictionary
brainstem   (brān'stěm')  Pronunciation Key 
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.
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