basal ganglion

noun Anatomy.
any of several masses of gray matter in each cerebral hemisphere.

Origin:
1910–15

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World English Dictionary
basal ganglia
 
pl n
the thalamus together with other closely related masses of grey matter, situated near the base of the brain

Collins English Dictionary - Complete & Unabridged 10th Edition
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Dictionary.com's 21st Century Lexicon
Main Entry:  basal ganglia
Part of Speech:  n
Definition:  the large masses of gray matter at the base of the brain which, if damaged, would impair motor abilities
Usage:  medicine
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American Heritage
Medical Dictionary

basal ganglia pl.n.

  1. The caudate and lentiform nuclei of the brain and the cell groups associated with them, considered as a group.

  2. All of the large masses of gray matter at the base of the cerebral hemisphere. No longer in technical use.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The problem is widely believed to begin in the basal ganglia, the part of the brain that controls motor function.
These are loosely grouped into the limbic system and the basal ganglia, although not everyone agrees what is what.
Specific areas of the brain, such as the basal ganglia, are more likely to be injured from liver failure.
Working with the cerebellum, which is located at the base of the skull, the basal ganglia control movement.
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