464 



THE BRAIN 



floor of the central part of the lateral ventricle, (b) That in 

 the substance of the thalamus two divided white bundles are 

 seen. The lower of the two bundles is the divided column 

 of the fornix on its way to the mamillary body ; and the higher 

 is the fasciculus mamillo-thalamicus on its way from the 

 mamillary body to the upper and anterior part of the thalamus. 

 (c) That, lateral to the thalamus is the lentiform nucleus, 

 clearly divided in this position into three parts by the two 

 medullary laminae, (d) That, between the lentiform nucleus, 

 laterally, and the thalamus and the caudate nucleus, medially, 

 is the internal capsule, (e) That, as the internal capsule passes 



Ventricular surface of 

 caudate nucleus 

 Caudate nucleus 



Anterior horn of lateral 

 ventricle 



Paraterminal body 

 (grey matter) 

 White matter of para- 

 terminal body 



Gyrus subcallosum - 



Supra-optic recess 

 Optic chiasn 



ar Corona radiata 



Internal capsule 



Lentiform nucleus 



Anterior perforated substance 



Optic tract 



FIG. 1 86. Frontal section through anterior Perforated Substance and the 

 anterior part of Corpus Striatum, after the dissection represented in Fig. 

 183 had been made on the left hemisphere. 



between the caudate nucleus and the upper part of the 

 lentiform nucleus, its fibres begin to diverge towards all the 

 adjacent parts of the cortex, forming the corona radiata. 

 (/) That the lower end of the internal capsule is continuous 

 with the upper and most anterior part of the pedunculus 

 cerebri. (g) That, from the pedunculus cerebri fibres are 

 passing laterally, below the lentiform nucleus, to the medullary 

 striae and the external capsule, (ti) That, immediately below 

 and lateral to the section of the pedunculus is the divided 

 optic tract. (/) That, lateral to the lentiform nucleus is the 

 external capsule, and still more laterally lie the claustrum and 

 the insula. 



