BONES OF THE THORACIC LIMB 



147 



curves over the groove. The groove is undivided. The distal articular surface 

 IS decidedly oblique, and the grooves and ridge are very well marked. The coro- 

 noid and olecranon fossje are deep and wide. The condyloid crest is represented by 

 a rough raised area. The proximal end unites with the shaft at three and one-half 

 to four years, and the distal at about one and one-half years. 



The radius is short and relatively broad. It is somewhat oblique, the distal 

 end being nearer the median plane than the proximal. The curvature is more 

 pronounced below than above. The shaft is prismatic in its middle part and has 



Fig. 145. — Left Httmeeus of Ox; 

 Lateral View. 

 1, Head; 2, neck; 3, 3', lateral 

 tuberosity; 4, rough prominence for 

 attachment of infraspinatus tendon; 

 5, deltoid tuberosity; 6, coronoid 

 fossa; 7, lateral condyle; 8, lateral 

 epicondyle ; 9, medial epicondyle ; 

 10, olecranon fossa. 



Fig. 146. — Left Humeru.^^ of Ox; 

 Anterior A'iew. 

 1, Lateral tuberosity; 2, medial 

 tuberosity; 3, intertuberal groove; 

 4, rough prominence for attach- 

 ment of infraspinatus tendon; 5, 

 deltoid tuberosity; 6, teres tubercle; 

 7, musculo-spiral groove; 8, coro- 

 noid fossa; 9, medial condyle; 10, 

 lateral condyle. 



Fig. 147. — Left Radius axd Ulna 



OF Ox; PoSTERO-MEDIAL ^'lEW. 



1, Olecranon; 2, processus an- 

 conaeus ; S, semilunar notch ; 4, 

 proximal extremity of radius; 5, 5', 

 proximal and distal interosseous 

 spaces; 6, shaft of radius; 7, shaft 

 of ulna; 8, vascular groove; 9, sty- 

 loid process of ulna. 



dorsal, volar, and lateral faces. There is a marked increase in width and thickness 

 distally. The proximal articular surface presents a synovial fossa which extends 

 medially from the deep groove between the two glenoid cavities. The radial 

 tuberosity is represented by a slightly elevated rough area. The facets for the ulna 

 are larger than in the horse. The two bones commonly fuse above the proximal 

 interosseous space and always fuse below it, except near the distal end, where there 

 is a small distal interosseous space. A groove connects the two spaces laterally. 

 The distal extremity is large, and is thickest medially. Its articular surface is 

 oblique in two directions, i. e., from within upward and backward. The grooves 



