Limbs : Upper Limb 



81 



it. and in front of this the Supinator longus (upper two-thirds) and Ext. carpi radialis 

 longior (lower third) : the inner ridge is for the inner septum. 



The lower end has the condyles on each side, a groove behind the inner condyle 



small 

 tu&erosLty 



tnalomical neck 

 facets 



gnat tuberosity 



coracdbrachialis 

 impression 



deltoid impression. 



musculo-spiral 

 groove 



rior bonier 



external- 

 supraconiLylar 



cranon 



ridge 



internal 

 condyLe 



external 

 condyle 



-jcapitukun 

 trochle* 



FIG. 61. Left humerus. A. anterior aspect; B. posterior aspect. To dis- 

 tinguish left from right, hold the bone with the rounded head above and 

 with its articular surface looking inwards, while the bicipital groove is in 

 front. 



lodging the ulnar nerve : immediately outside this a hinge-like articular surface, the 

 trochlea, for the ulna, and outside this the capitulum, a convex articular surface on the 

 front and lower aspect to articulate with the head of the radius. Above the trochlea 

 a deep olecranon fossa behind, and a shallower coronoid fossa in front, to receive the 

 corresponding parts of the ulna : above the capitulum in front a very shallow capitular 

 fossa. 



The humerus is held to the glenoid cavity of the scapula during movement 

 more by the surrounding muscles than by the tension of any ligaments. The 

 ligamentous capsule as a whole is thin, attached to the glenoid ligament and 



F.A. 



