256 



THE NERVOUS SYSTEM 



pallidus (Fig. 191). It is fused rostrally with the caudate nucleus, which it 

 resembles in color and structure. 



The globus pallidus is lighter in color and is subdivided into two parts, of 

 which the medial is the smaller. Both parts are traversed by many fine 

 white fascicles from the medullary laminae. 



Especially in the anterior part of the internal capsule bands of gray sub- 

 stance stretch across from the lentiform to the caudate nucleus, producing a 

 striated appearance (Fig. 187). This appearance, which is accentuated by the 

 medullary laminae and the finer fiber bundles in the lentiform nucleus, makes 



Tela chorioidea 

 ventriculi tertii 



Capsula in 



Nucleus 

 habenulae 

 Cauda nuclei 



caudati 

 Tractus opticus ~; 



Fimbria hippo- 

 campi 



Fascia dentata 

 hippocampi 



Pedunculus cerebri 



V cerebri interna. 



Plexus chorio- 

 'ideus ventriculi 



tertii 



Commissura 



habenularum 



Commissura 



posterior 



Aditus ad aquae- 

 ductum cerebri 



Fasciculus retro- 

 flexus(Meynerti) 



Cornu inferius 

 ventriculi 

 lateralis 



...Nucleus rubcr 



Nucleus hypo- 



thalamicus 



(Corpus Luysi) 



- x - Substantia nigra 

 Pons (Varoli) 



Recessus posterior fossae interpeduncularis/ 

 Fig. 189. Frontal section of the human brain through the rostral part of the pons. (Toldt.) 



the term corpus striatum an appropriate name to apply to the two nuclei and 

 the internal capsule, which separates them. 



The claustrum is a thin plate of gray substance, which, along with the white 

 matter in which it is embedded, separates the putamen from the cortex of the 

 insula. Its lateral surface is somewhat irregular, being adapted to the convolu- 

 tions of the insula, with which it is coextensive (Figs. 188, 191). Its concave 

 medial surface is separated from the putamen by a thin lamina of white matter, 

 known as the external capsule. By some authorities the claustrum is thought 

 to be a detached portion of the lentiform nucleus, while others believe that it 

 has been split off from the insular cortex. It is probable that neither of these 

 views is strictly correct. However, according to the recent work of Elliot 



