CHAP, vi.] 



THE BRAIN. 



627 



FIG. 86. 



FIGS. 86 AND 87. SIDE AND UPPER VIEWS OF THE BRAIN OF MAN, WITH THE 

 ABEAS OF THE CEREBRAL CONVOLUTIONS, ACCORDING TO FERRIEB. 



The figures are constructed by marking on the brain of man, in their respective 

 situations, the areas of the brain of the monkey as determined by experiment, 

 and the description of the effects of stimulating the various areas refers to the brain of 

 the monkey. 



(1) (On the postero-parietal [superior parietal] lobule). Advance of the opposite 

 hind limb as in walking. (2), (3), (4) (Around the upper extremity of the fissure of 

 Rolando). Complex movements of the opposite leg and arm, and of the trunk, as in 

 swimming, (a), (fc), (c), (d) (On the postero-parietal [posterior central] convolution). 

 Individual and combined movements of the fingers and wrist of the opposite hand. 

 Prehensile movements. (5) (At the posterior extremity of the superior frontal con- 

 volution). Extension forward of the opposite arm and hand. 



(6) (On the upper part of the antero-parietal or ascending frontal [anterior 

 central] convolution). Supination and flexion of the opposite foiearm. (7) (On 

 the median portion of the same convolution). Retraction and elevation of the 

 opposite angle of the mouth by means of the zygomatic muscles. (8) (Lower 

 down on the same convolution). Elevation of the ala nasi and upper lip with de- 

 pression of the lower lip, on the opposite side. (9), (10) (At the inferior extremity 

 of the same convolution, Broca's convolution). Opening of the mouth with (9) pro- 

 trusion and (10) retraction of the tongue; region of Aphasia, bilateral action. 



(11) (Between (10) and the inferior extremity of the postero-parietal convolution). 

 Retraction of the opposite angle of the mouth, the head turned slightly to one side. 



(12) (On the posterior portions of the superior and middle frontal convolutions). 

 The eyes open widely, the pupils dilate, and the head and eyes turn towards the 

 opposite side. (13), (13') (On the supra-marginal lobule and angular gyrus). The 

 eyes move towards the opposite side with an upward (13) or downward (13') 

 deviation. The pupils generally contracted. (Centre of vision.) (14) (On the 



402 



