regional_part_of Subcortical gray matter structure Substantia innominata FMA:61885 Innominate substance Nucleus of substantia innominata Subdivision of telencephalon which is an area of gray matter containing cell islands (basal nucleus) within the telencephalon which lies ventral to the head of the caudate nucleus, putamen, globus pallidus and anterior perforated substance. It is bounded caudally by the hypothalamus. fma Nucleus of brain