162 



Leyton and Sherrington 



Lips — The upper lip movements are rather closely associated with 

 movements of the nose^ but the lip has a much wider focal field than has. 

 the nose. The lips are represented largely together, but independent 

 movements of both upper and lower lips were seen. The field of repre- 

 sentation of the lower lip seems somewhat larger than that of the upper. 

 The areas for the lips are much commingled, but the representation of 



An u5 



icm 



Vocal -' 

 Cords 



Fig. 10. — Gorilla 1 ; {)erspective view traced from a photograph ; responses grouped 

 diagrammatically. C, opposite the end of the sulcus centralis. 



the lower lip seems to extend or to have its chief seat rather lower down 

 the centralis anterior than does the upper. Pouting of the lips was 

 distinct and not uncommon. Retraction of contralateral angle of the 

 mouth, either primary or secondary, seemed the most common of all the 

 lip movements. 



Nose. — Movements of the nose seemed better developed, and to have 

 a wider cortical representation in the orang than in chimpanzee or gorilla. 

 They were not so marked in the orang, however, as they were found to be 

 in the baboon (36, 7). 



