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extrapyramidal system

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extrapyramidal system

–noun Anatomy.
the part of the central nervous system, including the descending motor fibers other than those of the pyramidal tract, that regulates muscle tone, posture, and other aspects of body movement.

Origin:
1960–65
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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