Nervous and mental diseases . Fig. 68.—Functional areas of tine mesial surface of the left hemisphere (after Campbell). At the branching of the fissure of Sylvius motions of the tongue andplatysma are found, and immediately above them the muscles of the face,first the lower, then the upper face parts. Next in order we encounter. Fig. 69.—Relations of body to cortical areas. finger, wrist, elbow and shoulder movements; then those of the trunk, andhighest of all those of the lower extremity, which lap over the mesial marginof the hemisphere. 166 DISEASES OF THE BRAIN PKOPER. In front of the cent
Nervous and mental diseases . Fig. 68.—Functional areas of tine mesial surface of the left hemisphere (after Campbell). At the branching of the fissure of Sylvius motions of the tongue andplatysma are found, and immediately above them the muscles of the face,first the lower, then the upper face parts. Next in order we encounter. Fig. 69.—Relations of body to cortical areas. finger, wrist, elbow and shoulder movements; then those of the trunk, andhighest of all those of the lower extremity, which lap over the mesial marginof the hemisphere. 166 DISEASES OF THE BRAIN PKOPER. In front of the centers for the tongue and mouth parts, in Brocas con-volution, the third left frontal, motor vocal speech is represented. In left-handed individuals this motor function is located on the right side of thebrain. If we take the Rolandic area, from the superior margin of the half-brain to the Sylvian fissure, and divide it into fifths by horizontal parallellines, the face occupies the lowest two-fifths, the upper extremity thenext two-fifths, and the trunk and lower extremity the highest and re-maining fifth. Sensory Cortical Localization.—The impossibility of accurately de-termining sensory disturbances in animals is one of the major reasons for theconfusion that exists regarding the cortical representation of this functi
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