Definition of basal ganglion
: any of four deeply placed masses of gray matter (as the amygdala) in each cerebral hemisphere —called also basal nucleus
First Known Use of basal ganglion
Medical Definition of basal ganglion
: any of four deeply placed masses of gray matter within each cerebral hemisphere comprising the caudate nucleus, the lentiform nucleus, the amygdala, and the claustrum—usually used in plural; called also basal nucleus
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