312 FASCL£ 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 Biceps brachii 
Stump of flexor carpi radialis aes 
Brachialis 
Stump of flexor carpi. ulnaris Long medial ligament | 
Extensor carpi radialis / 
Superficial digital flexor 
Deep digital flexor Radius | 
Tendon of ulnar head 
Radial head of superficial flexor 
‘ ; ; Tendon of flexor carpi radialis 
Insertion of flexor carpi ulnaris ff m { 
Tendon of extensor carpi obliquus 
Accessory carpal bone f I q 
Deep flexor tendon 
Superficial flexor tendon 
Check ligament Me. III 
Suspensory ligament 
Annular ligament 
Fetlock joint 
Extensor branch of suspensory 
ligament 
Fic. 282.—Muscries or Lerr Tooracic Limp or Horse, FROM Etpow DowNnwarp; MepIAL 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 fasciw 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 
