556 



PHYSIOLOGY 



CHAP. 



In the cortex of the frontal lobe Griinbaum and Sherrington, 

 like Beevor and Horsley, found a large area completely separated 

 from the motor zone of the Rolandic area, faradisation of which 

 produces conjugate deviation of the eyes. The lower extremity of 

 the occipital lobe, and the region lying around, the lips of the 

 calcarine fissure, are excitable to faradisation ; conjugate movements 

 of the eyeballs may be also elicited from here. Griinbaum and 



Anus tf vagina.. 

 SuLct.cs 



Abdomen 



Cheat 



Fingers 

 ft thumb v. 



EyeUd / 

 Nose 



CLdsure 



of JAW. ^ / ' . . 

 J Opening 



ofj&w. 



VOCAL 

 cords. 



Sttlcus centrolis. 



Maatic&Gion 



Fio. 281. External surface of brain of orang, showing excitable areas. 

 (Griinbaum and Sherrington.) 



Sherrington, however, hesitate to include this region with the true 

 motor area represented by the Rolandic area. 



The two figures 281 and 282 give approximately the localisation 

 of the areas for the face, fore-limbs, trunk, and hind-limbs, as well 

 as the differentiation of the excitable points contained in each 

 area. Among these are centres for the special movements of the 

 ears, nostrils, palate (acts of sucking or mastication), vocal cords, 

 muscles of thorax, abdomen, pelvis, and of anal and vaginal orifices. 

 The faradisation of certain points produces not motor but inhibitory 

 effects similar to those described by Sherrington. 



These results of the experiments of Griinbaum and Sherrington 

 on anthropoid apes differ from those observed by Beevor and 



