brainstem, brain stem

brainstem, brain stem
Originally, the entire unpaired subdivision of the brain, composed of (in anterior sequence) the rhombencephalon, mesencephalon, and diecephalon as distinguished from the brain's only paired subdivision, the telencephalon. More recently, the term's connotation has undergone several arbitrary modifications: some use it to denote no more than rhombencephalon plus mesencephalon, distinguishing that complex from the prosencephalon (diencephalon plus telencephalon); others restrict it even further to refer exclusively to the rhombencephalon. From both developmental and architectural viewpoints, the original interpretation seems preferable. SYN: truncus encephali [TA].

Medical dictionary. 2011.

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  • brain stem — noun the part of the brain continuous with the spinal cord and comprising the medulla oblongata and pons and midbrain and parts of the hypothalamus • Syn: ↑brainstem, ↑brain stem • Hypernyms: ↑neural structure • Part Holonyms: ↑brain, ↑encephalon …   Useful english dictionary

  • brain-stem — noun the part of the brain continuous with the spinal cord and comprising the medulla oblongata and pons and midbrain and parts of the hypothalamus • Syn: ↑brainstem, ↑brain stem • Hypernyms: ↑neural structure • Part Holonyms: ↑brain, ↑encephalon …   Useful english dictionary

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  • brainstem — [brān′stem΄] n. a stalklike structure at the base of the brain that connects the spinal cord with the cerebrum and includes the medulla oblongata, pons, and midbrain: also written brain stem …   English World dictionary

  • brainstem — brain′stem or brain′ stem n. anat. the portion of the brain that is continuous with the spinal cord and in mammals comprises the medulla oblongata and parts of the midbrain • Etymology: 1875–80 …   From formal English to slang

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