. The brain as an organ of mind. r believing, also, that destructive disease ofthe Cerebral Convolutions in this region may lead, in thehuman subject, as it did in the monkey, to a conditionof complete Hemiplegia. In each, therefore, both inman and monkey, irritation of certain surface regions ofone of the Cerebral Hemispheres is followed by choreiformtwitchings or by actual Convulsions on the opposite sideof the body, whilst destruction of the same parts is fol-lowed by an opposite unilateral Paralysis. Irritation and XXVL] VOLUNTARY MOVEMENTS. 573 destruction of other regions of the s
. The brain as an organ of mind. r believing, also, that destructive disease ofthe Cerebral Convolutions in this region may lead, in thehuman subject, as it did in the monkey, to a conditionof complete Hemiplegia. In each, therefore, both inman and monkey, irritation of certain surface regions ofone of the Cerebral Hemispheres is followed by choreiformtwitchings or by actual Convulsions on the opposite sideof the body, whilst destruction of the same parts is fol-lowed by an opposite unilateral Paralysis. Irritation and XXVL] VOLUNTARY MOVEMENTS. 573 destruction of other regions of the surface of the brain inMonkeys, were followed by no such excitations or abolitionsof Movements. Details cannot here be given as to the effects producedby localized irritations or destructions of limited parts ofthe Convolutions within this excitable area. For thesethe reader is referred to Chap. viii. of Ferriers principal conclusions at which he has arrived may,however, be gathered from a careful study of Figs. 182,183,. Fio. 182.—Lateral aspect of Monkeys Brain, showing the relative positions of thefio-called Motor Centres in the left Cerebral Hemisphere. (Ferrier.) For referencessee Text, and also Fig. 172. in which, as a result of his investigations, the seats of thedifferent supposed centres for special Movements areindicated. They are as follows :— (1.) Centres for movements of the opposite leg and foot, such asare concerned in locomotion—in fostero-poirietal lobule. (2, 3, 4.) Centres for various complex movements of the armsand legs, such as are concerned in climbing, swimming, &c.—inthe convolutions hounding the upper extremity of the fissure ojRolando. (5.) Centres for the extension forwards of the arm and hand, asill putting forth the hand to touch something in front—\i\ posteriorextremity of superior frontal convolation. 574 WILL AND (6.) Centre for the movements of the hand and forearm in whichthe biceps is particnlarly engaged (viz., supination o
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