768 



CORTICAL MOTOR REGION IN MAN. [Book hi. 



Oc.l, 



Fr.L. 



Te.L? 



Fig. 136. 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- 

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

 shewn for the sake of comparison of it with the position of the other areas ; 

 the representation of speech in the cortex cerebri lies however in the left hemis- 

 phere chiefly. 



Oc. L. Occipital lobe ; Fr. L. Frontal lobe ; Te. L. Temporal lobe ; Sy. f. 

 the fissure of Sylvius ; C.f. the central fissure (Rolandic) ; Cm. f. indicates the 

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



Fr.L 



Oc.L 



Te.L 



Fig. 137. The Mesial Surface of the Right Cerebral Hemisphere of Man 

 in outline, to illustrate the cortical areas. 



The areas shewn are those connected with the movements of the leg, and 

 with the senses of sight and smell. 



Fr. L. the frontal pole of the hemisphere; Oc. L. the occipital pole, Te. L. 

 the temporal pole. Cm.f. 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. 



