188 



THE GENERAL ANATOMY OF GORILLA 



[sect, a 



plantar arterial arch being still predominant. Such dispositions 

 of the limb arteries are determined by the pressure to which 

 various aspects of the respective limbs are subject. This pressure 

 will in turn be influenced by the functions of the limb. Thus the 

 lack of full development of the superficial palmar arteries suggests 

 that the hand has not been emancipated fully from its use as a 

 support in locomotion. Again, the use and form of the lower limb 

 permit of the retention of the A. saphena, and this results in a 

 greater supply to the plantar aspect of the foot via the A. dorsalis 

 pedis (the continuation of the A. saphena). 



Intraparietal sulcus 



Central sulcus 



Sulcus lunatus 



Inferior occipital Sulcus 



Ant.limiting 

 -sulcus of Reil 

 (fronto-orbital) 



Sup-limih'ng 

 sulcus of Reil 



Parallel sulcus 



Fissure of Sylvius 

 (post, limb) 



Olf.n. 



Fig. 123. Lateral aspect of the right cerebral hemisphere of a young Gorilla 

 (Simiidae). The olfactory nerves are attenuated in point of size: the cerebral 

 surface is much more convoluted than in the preceding examples and recalls the 

 appearance of the human cerebrum. (Mus. Anat. Cant. Specimen Cr.) 



H. Nervous System. The brain of the Gorilla (Figs. 123, 124) 

 is much smaller than that of Man, but in regard to its conformation, 

 it may be described as providing a sketch-plan of the human organ. 

 The Simiidae have made a most distinct advance beyond the 

 Cercopithecidae in respect of their cerebral characters, though 

 the brain of Hylobates suggests the path pursued in evolution by 

 the three larger forms (Orang-utan, Chimpanzee, and Gorilla). 

 A brief account of the purely morphological conformation of the 

 Gorilla's brain has been appended for purposes of reference, but 

 h«rc a lew suggestions may be offered in regard to the nature of 

 the Gorilla as revealed in the structure of its brain. 



