574 



WILL AND 



(6.) Centre for the movements of the hand and forearm in which 

 the biceps is particnlarly engaged (viz., supination of the hand and 

 flexion of the forearm) — near middle of ascendinrj frontal, oi^'posite 

 'posterior extreniitij of middle frontal convolution. 



(7 and 8.) Centres for the elevators and depressors of the angle 

 of the mouth — in loiuer end of ascending frontal convolution. 



(9 and 10), included together in one, is said to be the centre for 

 the movements of the lips and tongue, as in articulation — in 



posterior extremity of the 

 lower or third frorital con- 

 volution (' Broca's convolu- 

 tion '). 



(11.) Centre for retrac- 

 tion of angle of mouth — in 

 supra • marginal convolu- 

 tion, near loiuer end of 

 ascending itarietal. 



(12.) Centre for lateral 

 movements of the head and 

 eyes, with elevation of the 

 eyelids and dilatation of 

 the pupil (attitude of 'atten- 

 tion ') — in 'posterior parts 

 of upper and middle frontal 

 convolutions. 



{a, h, c, d.) Centres for 

 movements of the hand and 

 wrist — in the ascending 

 parietal convolution. 



The relative position of 



showing the relative positions of some of the -^^jese supposed ' motor cen- 

 so-called 'Motor Centres/ in the left Cei^bral , . ^ ,^ ^^ ^^^^ ^f ^^^^ 



Hemisphere. (Ferrier.) For references see Text, ^^'^^ ^ 



and also Fig. 172. most import ant alleged 'sen- 



sory centres ' is also shown 

 in Fig. 182, in which the circles 13 and 13' indicate what is regarded 

 •by Ferrier as the Visual Centre {in the supra-marginal lohule and 

 the angular gyrus), whilst the circles 14, 14 indicate the situation 

 of the Auditory Centre {in the upper temporal convolution). The 

 centres of Touch, Smell, and Taste are, as we have previously 

 inontioned (pp. 53r,-r)40), believed to be located in convolutions on 

 the inner aspect and tip of the Temporal Lobe. 



Fig. 183. — Upper aspect of Monkey's Brain, 



