' THE BRAIN. 587 
pass fibers that spread out toward the cortex, as the corona 
radiata, 
& 
Fia._888.—Transverse section of cerebral hemispheres, at level of cerebral ganglia (after 
aay 1, great longitudinal fissure ; 2, part of same between occipital lobes ; 3, anterior 
co! 
part of corpus callosum ; 4, fissure of Sylvius ; 5, convolutions of island of Reil (insula); 6, 
caudate nucleus of corpus striatum ; 7, lenticular nucleus of corpus striatum ; 8, optic 
thalamus ; 9, internal capsule ; 10, external capsule ; 11, claustrum. 
Pathology, especially, has shown that a lesion of the intra- 
ventricular -portion of the corpus striatum, and, above all, of 
the internal capsule, is followed by failure of voluntary move- 
ment (akinesia). It would appear that a great part of the 
fibers from the motor area around the fissure of Rolando, pass 
through the intra-ventricular parts of the ‘corpus striatum, and 
especially its internal capsule. But it is also to be borne in 
mind that a large part of the fibers passing from the cortex 
make connection with the cells of the corpus striatuin before 
reaching the cord. These facts render the occurrence of loss of 
voluntary motor power comprehensible. 
The fibers of the peduncles of the brain may be divided into 
