678 



THE BRAIN. 



occurring on the right side. On the whole, perhaps, the evidence of clinical 

 study tends to show that in man the loss of movement due to the destruction 



FIG. 154. 



Oc.L. 



Fr-.L. 



Te.L. 



The Lateral Surface of the Right Cerebral Hemisphere of Man in Outline, to illustrate the 

 Cortical Areas. (Reduced from nature.) The position of the areas of the cortex concerned with 

 movements of the face, arm, and leg, and with the senses of sight and hearing are approximately 

 shown. The position of the area connected with speech (Broca's centre) is also shown for the sake 

 of comparison of it with the position of the other areas; the representation of speech in the cor- 

 tex cerebri lies, however, in the left hemisphere chiefly. Oc. L, occipital lobe ; Fr. L, frontallobe ; 

 Te. L, temporal lobe ; Sy.f, the fissure of Sylvius; C.f, the central fissure (Rolandic) ; Om.f, indi- 

 cates the position of the posterior end of the calloso-marginal fissure. 



FIG. 155. 



Fr.L. 



Oc.L. 



Te.L. 



The Mesial Surface of the Right Cerebral Hemisphere of Man in Outline, to illustrate the 

 Cortical Areas. The areas shown are those connected with the movements of the leg and with 

 the senses of sight and smell. Fr. L, the frontal lobe of the hemisphere : Oc. L, the occipital 

 lobe; Te. L, the temporal lobe ; Cm./, the calloso-marginal fissure separating the marginal gyrus 

 above from the gyrus fornicatus below; Cf, marks the situation of the central fissure, the fissure 

 itself not being apparent on the mesial aspect of the hemisphere. The corpus callosum and the 

 anterior commissure are seen in cross section. 



by disease of an area is a permanent one, though actual demonstration of 

 this is wanting. 



