basal ganglion

n.
Any of several masses of gray matter embedded in the cerebral hemispheres that are involved in the regulation of voluntary movement. Also called basal nucleus.

n

A group of fore-brain nuclei that, with the related structures of the brain, play an important role in the regulation of muscle tone and motor control. The cell groups of these ganglia and their respective nerve tracts are classified as the extrapyramidal motor system to differentiate them from the pyramidal motor system, which goes directly from the cerebral cortex to the lower motor neuron. Disease associated with the basal ganglia is manifested by three principal motor abnormalities: disturbance of muscle tone, derangement of movement, and loss of associated or automatic movement.

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The noun has one meaning:

Meaning #1: any of several masses of subcortical gray matter in each cerebral hemisphere that seem to be involved in the regulation of voluntary movement

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