1 8 THE SURGICAL ANATOMY OF THE HORSE 



The inner edge of the radius (38) is represented throughout its 

 extent. Near the upper extremity of this bone is seen the insertion of 

 the biceps muscle into the bicipital tuberosity. 



The inner small metacarpal bone (55) is visible throughout its 

 extent excepting a small portion of its head, which is concealed by the 

 insertion of the extensor metacarpi obliquus (46) and by the fibrous 

 band connecting the pisiform bone with the internal lateral ligament of 

 the knee. 



The inner half of the large metacarpal bone (53) is represented, 

 as is also the greater part of the lateral aspect of the os suffraginis, 

 excepting that part which is covered by the inner division of the 

 suspensory ligament. 



The Ligaments 



The edge of the subcarpal or check ligament is much more distinct 

 than on the outer aspect. It appears between the internal metacarpal 

 vein and the large metacarpal artery, the latter having been drawn 

 slightly backwards. 



The inferior portion of the suspensory ligament is plainly represented, 

 as is also its inner branch (61). This ligament has already been 

 described. 



The Muscles and Tendons 



The Subscapularis (i). — This muscle covers almost the whole of the 

 deep face of the scapula. It lies in the subscapularis fossa, from the 

 whole extent of which it arises. Above the muscle is the cartilage of 

 prolongation (2), which is attached to the vertebral edge of the scapula. 

 The muscle is inserted into the posterior division of the inner tuberosity 

 of the humerus. In front of the muscle we have the supraspinatus (3), 

 and behind it the teres major (4). 



The subscapularis is an adductor of the shoulder, and is supplied by 

 the subscapular nerve. 



