Nervous and mental diseases . is much lessextensive than was formerly thought. The functional groups of skeletalmuscles are represented in the precentral or ascending frontal convolu-tion from the lower end of Rolandos fissure up to the midline of the brain,and to a slight extent on the mesial surface of the hemisphere, in a con-tinuous narrow zone. The bottom of the fissure of Rolando sharplybounds the motor area behind, and it extends forward not to exceed thewidth of the precentral gyre. Liepman2 and Wilson3 have shown conclusively that the ability toperform skilled movements with the limbs
Nervous and mental diseases . is much lessextensive than was formerly thought. The functional groups of skeletalmuscles are represented in the precentral or ascending frontal convolu-tion from the lower end of Rolandos fissure up to the midline of the brain,and to a slight extent on the mesial surface of the hemisphere, in a con-tinuous narrow zone. The bottom of the fissure of Rolando sharplybounds the motor area behind, and it extends forward not to exceed thewidth of the precentral gyre. Liepman2 and Wilson3 have shown conclusively that the ability toperform skilled movements with the limbs resides in the first and second 1 Histological Studies of the Localization of Cerebral Functions, 1905. 2 Monatsschr. f. Psychiatr. u. Neurol., 1900, 1906, Brain, 1908. THE CEREBRAL CORTEX—LOCALIZATION. 169 convolutions of the left side. Their destruction results in a loss of suchmotions, called apraxia, analogous or identical with motor aphasia andagraphia. This state may be unattended by any evidence of Fig. 68.—Functional areas of the mesial surface of the left hemisphere (after Campbell). At the branching of the fissure of Sylvius motions of the tongue andplatysma are represented, and immediately above them the muscles ofthe face—first the lower, then the upper, face parts. Next in order we
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