When divided horizontally, it exhibits, to some extent, the appearance of a biconvex lens, while a coronal section of its central part presents a somewhat triangular outline. It is shorter than the caudate<unk>  and does not extend as far forward. Boundaries It is lateral to the caudate<unk>  and thalamus, and is seen only in sections of the hemisphere. It is bounded laterally by a lamina of white substance called the external capsule, and lateral to this is a thin layer of gray substance termed the claustrum. Its anterior end is continuous with the lower part of the head of the caudate<unk>  and with the anterior perforated substance. Components In a coronal section through the middle of the<unk> , two medullary laminae are seen dividing it into three parts. The lateral and largest part is of a reddish color, and is known as the putamen, while the medial and intermediate are of a yellowish tint, and together constitute the globus pallidus; all three are marked by fine radiating white fibers, which are most distinct in the putamen.
Lentiform nucleus
Globose nucleus
Reticulotegmental nucleus
Habenular nuclei
Arcuate nucleus 
Periventricular nucleus
Sublingual nucleus
Fusiform body area