312 



FASCIiE AND MUSCLES OF THE HORSE 



Structure.— The humeral head is much the larger, constituting, in fact, the 

 bulk of the muscle. It is flattened, curved, and tapers at both ends. _ The ulnar 

 head, much smaller and very thin, is covered by an aponeurosis from which many of 

 its fibers arise. It joins the large head a little above the middle of the forearm. 



Ulnar head of deep flexor 

 Stump of flexor carpi radialis— — ^IR^^J 



Stump of flexor carpi ulnaris" \ll j fi\ \\ 



Superficial digital flexor 

 Deep digital flexor 



Biceps brachii 



■ Brachialis 



-Long medial ligament 



. Extensor carpi radialis 



. Radius 



Tendon of ulnar head 



Radial head of superficial flexor 

 Insertion of flexor carpi ulnaris 

 Accessory carpal bone 



Deep flexor tendon 

 Superficial flexor tendon 



Check ligament 



Suspensory ligament — 



Annidar ligament 



Deep flexor tendon 

 Cartilage of third phalanx 



^, 



Tendon of flexor carpi radialis 

 Tendon of extensor carpi ohliquus 



- Mc. Ill 



Fetlock joint 



Extensor branch of suspensory 

 ligament 



Fig. 282. — Muscles of Left Thoracic Limb of Horse, from Elbow Downward; Medial View. 

 Parts of superficial muscles have been removed, carpal canal opened up, and flexor tendons drawn backward. 



The tendon of insertion is short and strong; it blends with the posterior annular 

 ligament of the carpus. 



Relations. — Superficially, the tensor fasciae antibrachii, superficial pectoral, and 

 flexor carpi radialis, the skin and fascia, and cutaneous branches of the ulnar 

 nerve; deeply, the superficial and deep flexors of the digit. In the distal half of 



