26 Dr. C. E. Beevor. On the Distribution of the [May 8, 
Lenticular nucleus, external segment, anterior inferior part by the anterior 
cerebral, the rest by the middle cerebral. Middle segment by the middle 
cerebral. Internal segment by the anterior choroid. 
Optic thalamus, anterior nucleus, by the posterior cerebral. Haternal nucleus 
anteriorly by the posterior communicating, posteriorly by the posterior 
cerebral. Internal nucleus by the posterior cerebral, anterior half sometimes 
by the posterior communicating. Pulvinar by the posterior cerebral. 
Choroid plexus in the descending and posterior cornua by the anterior 
choroid, in the central part of the lateral ventricle by the posterior cerebral. 
Choroid membrane in the descending cornu, anterior part by the anterior 
choroid, the rest of the membrane by the posterior cerebral. 
Optic tract by the anterior choroid. 
Anterior commissure in the median part by the anterior cerebral, in the 
outer part by the middle cerebral, and in the postero-external part by the 
anterior choroid. 
On the cortex the areas of supply of the chief arteries differ in their extent 
from the description given by Duret, and are most commonly as follows :— 
Anterior cerebral artery, on median surface of cortex, to half way along 
the quadrate lobule; on external surface, posteriorly to half way along the 
parietal lobule, inferiorly to the sulcus frontalis superior. | 
Middle cerebral artery, on outer surface, posteriorly to the occipital pole or 
half an inch anterior to it, superiorly to the middle line along the posterior 
half of the parietal lobule, inferiorly to the middle of the inferior temporal 
gyrus ; on median surface to include the hippocampal lobule. 
Posterior cerebral artery, on median surface, anteriorly and superiorly to 
the posterior half of quadrate lobule ; on external surface at the median line 
anteriorly to the external parieto-occipital fissure, posteriorly to the occipital 
pole or to half an inch anterior to this, and inferiorly to the middle or 
superior border of the inferior temporal gyrus. 
The optic radiations in the occipital lobe are supplied in the upper 
(vertical) three-fourths by the middle cerebral and in the inferior one-fourth 
by the posterior cerebral artery, except in the posterior inch, where all by 
the posterior cerebral. 
The following parts are also supplied by the cortical arteries :— 
The corpus callosum, the genu, rostrum and body by the anterior cerebral ; 
the tapetum by the anterior, middle or posterior cerebral; the splenium and 
forceps major by the posterior cerebral artery. 
The wneus by the anterior choroid artery. 
The cornu ammons by the anterior. choroid artery or the posterior 
cerebral artery. 
