666 



THE BKAIN. 



the precentral suleus, ventral to the arm area lies a small area for move- 

 ments of the eyelids, brought about by contractions of the orbicularis mus- 

 cle. Ventral to this again is the " area for the face," in which we may dis- 

 tinguish an area for the mouth, that is an area stimulation of which pro- 

 duces changes in the buccal orifice, opening, shutting, drawing to one side, 

 etc., and an area for movements of the tongue. These two areas reach down- 

 ward to the fissure of Sylvius and backward to the line of the intra-parietal 

 sulcus. In front of them, occupying all the ventral part of the precentral 

 convolution and reaching forward as far as the precentral sulcus, where it 



FIG. 148. 



Outline of Brain of Monkey (Macacvs) to show Principal Sulci (Fissures) and Gyri (Convolu- 

 tions). (Sherrington, after Horsley and Schafer.) Natural size. The brain figured is the same as 

 that in Fig. 14'J, and the two figures should be consulted together. Over each sulcus. purposely 

 printed very thick, the name is written in SMALL CAPITALS, over each gyrus in italics, x indicates 

 the small depression, hardly to be called a sulcus, which is supposed to be homologous with the 

 superior frontal sulcus of man ; and w, y, z, similarly indicate sulci whose homologies are not 

 certain. For some synonyms see Figs. 152, 154. 



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

 movements of the pharynx or larynx, as well as of 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 referring to the 

 nerves concerned in carrying out the several movements, though in doing 



