CHAP, ii.] 



THE BRAIN. 



1041 



reach downwards to the fissure of Sylvius, and backwards to the 

 line of the intra-parietal sulcus. In front of them, occupying 

 all the ventral part of the precentral convolution and reaching 

 forwards as far as the precentral sulcus, where it meets the area 



TRUNK --... 



FIG. 126. LEFT HEMISPHERE OF THE CEREBRUM OF MACACUS MONKEY VIEWED FROM 

 ITS LEFT SIDE, AND FROM ABOVE. Natural size. (Sherrington after Horsley and 

 Beevor.) 



The figure shews the positions of the portions of the cortex concerned with move- 

 ment of various parts, and with the senses of sight, smell, and hearing. The 

 cortical area connected with the movements of the leg is shaded vertically 

 across, that with the movements of the arm horizontally, and that with the 

 movements of the trunk in a slanting direction; the area connected with 

 movements of the head (neck), face, and eyes is dotted. The course of the 

 chief fissures is indicated by single lines. 



for the eyes, lies an area stimulation of which produces movements 

 of the pharynx or larynx as well as the mouth or face, and which 

 may be divided into areas for mastication, for swallowing, and for 

 the production of the voice. 



We might speak of these several areas in another way by 



662 



