Nervous and mental diseases . n 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. Liepman - and Wilson ^ have shown conclusively that the ability toperform skilled movements with the limbs resides in the first a
Nervous and mental diseases . n 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. Liepman - and Wilson ^ 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. IseuroL, 1900, 1906, 1907. 3 Brain, 1908. THE CEREBRAL CORTEX—LOCALIZATION. 169 frontal convolutions of the left side. Their destruction results in a lossof such motions, a condition called apraxia, analogous to or identicalwith motor aphasia and agraphia. This state may be unattended byany evidence of Fig. 68.—Functional areas of the mesial surface of the left hemisphere (after Campbell). At the branching of the fissure of Sylvius motious of the tongue andplatysma are reprc-sented, and immediately above them tlie muscles ofthe face—first the lower, then the upper, face parts. Next in order we
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