BLOOD-SUPPLY OF THE BRAIN. 



197 



lutions are supplied by the middle cerebral artery. The lower portion of the lobe 

 by the posterior cerebral. 



Inner surface of the hemispheres. The whole anterior and upper portion, as far 

 back as the parieto-occipital fissure, is supplied by the anterior cerebral artery ; the 

 cuneate lobule and the occipito-temporal region by the posterior cerebral. 



The distribution of arteries to the several parts of the cerebral cortex is 

 illustrated in the accompanying diagrams (fig. 138). 



The corpus callosum is chiefly supplied by the anterior cerebral. 



The grey substance at the base of the cerebrum is supplied by small twigs from 

 the adjacent vessels of the circle of Willis, or from the roots of the cerebral 

 vessels which pass off from the anastomosis. 



Central parts corpus striatum. Both nucleus caudatus and nucleus lenticularis 



are supplied almost exclusively by the middle cerebral artery, the numerous branches 

 to these parts entering through the foramina in the anterior perforated space 

 (fig. 136). They are divided by Duret into lenticular, lenticulo-striate, and lenticulo- 

 optic (lenticulo-thalamic). These pass directly to their destination without anasto- 

 mosing with one another, and traverse the zones of the lenticular nucleus and the 

 internal capsule, to terminate finally in the caudate nucleus and optic thalamus 

 (fig. 139). One in particular of the lenticulo-striate arteries which passes through 

 the outer part of the putamen is very frequently the seat of haemorrhage, and 

 it has accordingly been termed by Charcot the " artery of cerebral haemorrhage " 

 (fig. 139, z). 

 The anterior part of the caudate nucleus is also supplied by the anterior cerebral, 



