132 



THE CORPUS STRIATUM. 



layer of ependyma and over this by the ciliated ventricular epithelium. The ganglion 

 is itself composed of a reddish grey substance like that of the outer zone of the 

 lenticular nucleus (see below). On the deeper side, that turned towards the internal 

 capsule, the nucleus receives from this a number of bundles of medullated fibres 

 which are^traceable from the crusta. According to Wernicke it is doubtful if any of 

 these pass on to the white matter of the hemispheres, nor do they come from the 



Fig. 96. VIEW FROM BEHIND OF A FRONTAL SECTION OF THE HEMISPHERES PASSING THROUGH THE 

 GENU OF THE CORPUS CALLOSUM. (E. A. S. ) From a photograph. 



g.c.c., genu corporis callosi ; c.a., cornu auterius of lateral ventricle bounded laterally by the grey 

 mass of the corpus striatum ; cl., claustrum ; I.R., insula ; Sy., Sylvian fissure ; c-m.s., sulcus calloso- 

 marginalis; s.f.s., sulcus frontalis superior; s.f.i., sulcus precentralis ; s.olf., sulcus olfactorius ; 

 fr.orb., orbital surface of frontal lobe ; tr.olf., tractus olfactorius in section. 



The section passes a little more anteriorly through the left hemisphere than through the right. 



crusta directly, but only after traversing the medullary laminge of the lenticular 

 nucleus (see below). 



The nerve-cells of the nucleus caudatus are multipolar, and, in the adult, pig- 

 mented. Some are moderately large, but most small, belonging to Golgi's second 

 type, with short axis-cylinder process (Marchi). Their nerve-processes pass in 

 various directions, some into the internal capsule. In addition, peculiar spheroidal 

 cells containing two or more nuclei were described by Henle. 



The nucleus lenticttlaris (exlraventricular portion of the corpus striatum) is 

 separated in the greater part of its extent from the intraventricular part by a layer 



