part of globus pallidus BTO:0002246 BrendaTissueOBO The smaller and more medial part of the lentiform nucleus of the brain, separated from the putamen by the lateral medullary lamina. In official anatomic nomenclature, it is divided by the medial medullary lamina into two parts, lateral and medial, both of which have extensive connections with the corpus striatum, thalamus, and mesencephalon. The paleostriatum is the phylogenetically older part of the corpus striatum represented by the globus pallidus. pale body paleostriatum pallidum nucleus lentiformis