CH. XV.] 



GENERAL CHARACTERS. 



267 



as great (t) and small (?) from their relative size in Man and 

 most other Mammals ; the former is also called external, and 

 the latter internal, from their relative situation in the most 

 usual position of the bone. 



The lower or distal extremity of the humerus is some- 

 what flattened, and usually has a broad, semi-cylindrical 

 articular surface, which is received into a corresponding 



ar 



OIL 



FIG. 86. Anterior surface of right humerus of Wombat (Phascolomys vombatus), J 

 h head ; bg bicipital groove ; t great or external tuberosity ; t' small or internal 

 tuberosity ; dr deltoid ridge ; sr supinator ridge ; cf supra-condylar foramen ; 

 ec external condyle ; ic internal condyle ; ar articular surface for radius ; au arti- 

 cular surface for ulna. 



concavity on the upper end of the bones of the fore-arm. 

 This is called the trochlea (ar and ait). On each side, and 

 rather above this surface, is a prominence called the condyle, 

 one of which is external, or radial (ec), the other internal, or 

 ulnar (ic). The latter is usually the most prominent. 1 In 



1 "In anthropotomy, the term 'condyle' rightly applied to the 

 prominent articular convexities of the occipital, mandibular and femoral 



