Bones of the Upper Extremity. 



108, The Right Hu- 

 merus, Os humeri, 



from behind. 



Above the trochlea 

 on the anterior side lies the 

 shallow coronoid fossa, Fovea 

 supratrochlearis anterior (for the 

 coronoid process of the ulna) 

 (Fig. 107), on the posterior 

 side the deep olecranon fossa, 

 Fovea sitpratrochlearis posterior 

 (for the olecranon process of 

 the ulna). 



Above the trochlea and ca- 

 pitellum there is on the inner 

 side the larger internal con- 

 dyle, Condylus interims., 011 the 

 outer side the smaller exter- 

 nal condyle, Condylus externus ; 

 the former serves for the in- 

 sertion of the flexor muscles, 

 the latter for the insertion of 

 the extensor muscles of the 

 hand. Between the trochlea 

 and the internal condyle a 

 small furrow, Sulcus ulnaris 

 (for the ulnar nerve), runs 

 along the posterior side. 



The h u m e r u s articu- 

 lates with three bones; with the 

 scapula, ulna and radius. 



Coil 



_ dylua 

 externus 



