OSTEOLOGY. 



53 



Its muscular attachments are twenty-five subscapularis, 

 supra- and infra- spinatus, teres major and minor, pectoralis 

 major, latissimus dorsi, deltoid, coraco-brachialis, brachialis an- 

 ticus, triceps, pronators and flexors to inner condyle, pronator 

 radii teres, flexor carpi radialis, palmaris longus, flexor sublimus 

 digitorum, flexor carpi ulnaris, supinators and extensors to outer 

 condyle, supinator longus, extensor carpi radialis longior and 



FIG. 22. 



1, shaft ; 2, head ; 3, neck ; 4, greater 

 tuberosity ; 5, lesser tuberosity ; 6, pos- 

 terior bicipital groove ; 7, impression 

 for deltoid; 8, bicipital groove; 10, 

 nutrient foramen ; 11, capitellum ; 12, 

 trochlea; 13, external condyle; 14, in- 

 ternal condyle ; 15 and 16, external and 

 internal supra-condyloid ridges. 



FIG 



1, shaft of ulna ; 2, greater sigmoid 

 cavity; 3, lesser sigmoid cavity; 4, olec- 

 ranon ; 5, coronoid process ; 6, nutri- 

 ent foramen : 7, interossecns borders- 

 8, head of ulna; 9, stylold process of 

 ulna ; 11, head of radius ; 12, neck, of 

 radius ; 13, tuberosity of radius ; 14 shaft 

 oi radius ; 15, carpal extremity of radi- 

 us ; 16, styloid process ot radius. 



brevior, extensor communis digitorum, extensor minimi digiti, 

 extensor carpi ulnaris, anconeus and subanconeus, supinator 

 brevis. 



Its ossific centres are seven one each for head, shaft, tuber- 

 osities, condyles, radial head, and trochlear portion. 



THE ULNA is a long bone to the inner side of the forearm, 

 and consists of a shaft and an upper and lower extremity. It 

 forms the greater part of the articulation with the humerus, but 



