The term entopeduncular nucleus in human neuroanatomy refers to a portion of the nucleus of the ansa lenticularis described variously as located medial to the posterior limb of the internal capsule ( Riley-1943 ), along the course of the ansa lenticularis and the inferior thalamic peduncle ( Crosby-1962 ), or as a separate nucleus within the internal capsule adjacent to the medial segment of the globus pallidus ( Nomina-1983 ).