| Noun | 1. | lenticular nucleus - a basal ganglion shaped like a lens and including the outer reddish putamen and the inner pale yellow pallidum basal ganglion - any of several masses of subcortical grey matter at the base of each cerebral hemisphere that seem to be involved in the regulation of voluntary movement putamen - the outer reddish part of the lenticular nucleus corpus striatum, striate body, striatum - a striped mass of white and grey matter located in front of the thalamus in each cerebral hemisphere; consists of the caudate nucleus and the lenticular nucleus |