Brain surgery . .—Diagram (after Eberstaller) of the Fissures and Convolutions of the Con-vexity of the Right Hemisphere of the Brain. Tlu relative depth of the fissuresis indicated by the shading. The extent of the functional areas is indicated bythe dotted lines. tion of muscular sensations in the area just behindthat of motion. The median surface of the hemisphere in frontof the paracentral lobule is known to be related tomovements of the trunk in monkeys, but thesemovements are rarely affected by disease in man andtheir cortical representation is still uncertain, though THE DIAGNOSIS OF CE
Brain surgery . .—Diagram (after Eberstaller) of the Fissures and Convolutions of the Con-vexity of the Right Hemisphere of the Brain. Tlu relative depth of the fissuresis indicated by the shading. The extent of the functional areas is indicated bythe dotted lines. tion of muscular sensations in the area just behindthat of motion. The median surface of the hemisphere in frontof the paracentral lobule is known to be related tomovements of the trunk in monkeys, but thesemovements are rarely affected by disease in man andtheir cortical representation is still uncertain, though THE DIAGNOSIS OF CEREBRAL DISEASE. 5 a case reported by Horsley points to the cortex infront of the leg area on the convexity as the probablelocation of the trunk area. There are no sharply defined sections of the motorarea to be assigned to special motions. Each motion,each part of a limb, has a wide general representationover the cortex and a special representation at a lim-ited area. Horsley says that the areas of representa-. Fig. 2.—Diagram of the Fissures and Convolutions of the Convexity of the LeftHemisphere of the Brain. The speech areas are shown on this hemisphere. Themotor area is more extensive than on the right hemisphere. tion of different limbs merge into one another; thusin the representation of the thumb we find that thereis a focus, but that the thumb is represented over agreat deal of the upper limb region, and that this rep-resentation diminishes in intensity gradually as wepass from the focus upward. This explains the factthat the excision of a small area does not totally para- 1 Amer. Jour. Med. Sci., April, 1887, Case III., Fig. 18. 6 BRAIN SURGERY. lyze the portion of the limb represented chiefly onthat area. The adjacent areas represent to some ex-tent that limb and hence can govern it if need be. (2) The speech areas (Fig. 2) are of four kinds andin four locations. They are limited to the left hem-isphere in right-handed persons and to the right hemi-sphere in left-
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