NEUROLOGY 





separated by the stria terminalis and the terminal vein. It is then continued 

 downward into the roof of the inferior cornu, and ends in the putamen near the 

 apex of the temporal lobe. It is covered by the lining of the ventricle, and crossed 

 by some veins of considerable size. It is separated from the lentiform nucleus, 

 in the greater part of its extent, by a thick lamina of white substance, called the 

 internal capsule, but the two portions of the corpus striatum are united in front 

 (Figs. 743, 744). 



Genu of corpus callosum 

 Anterior cornu of lateral ventricle 



Caudate nucleus 



Septum pellucidum 



Internal capsule (frontal part) 



Column offornix 



Genu of internal capsule 



Putamen 



Globus pallidus 



Internal capsule (occipital part) 



Thalamus 



Tail of caudate nucleus 

 Hippocampus 



Inferior cornu of lateral ventricle 



Area striaca, 



Posterior cornu of lateral ventricle 



External capsule 

 Claustrum 

 Insula 



2 Optic radiation 



FIQ. 742. Horizontal section of right cerebral hemisphere. 



The lentiform nucleus (nucleus lentiformis; lenticular nucleus; lenticula) (Fig. 741) 

 is lateral to the caudate nucleus and thalamus, and is seen only in sections of the 

 hemisphere. When divided horizontally, it exhibits, to some extent, the appearance 

 of a biconvex lens (Fig. 742), while a coronal section of its central part presents a 

 somewhat triangular outline. It is shorter than the caudate nucleus and does not 

 extend as far forward. 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 nucleus and with the anterior perforated substance. 



In a coronal section through the middle of the lentiform nucleus, 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 



