. The anatomy of the domestic animals . Veterinary anatomy. 374 THE MUSCLES OF THE DOG its tendon divides at or near the carpus into two branches, which are inserted into the third phalanges of the third and fourth digits, blending with the corresponding tendons of the common extensor. The posterior muscle is the extensor of the fifth digit (M. extensor digiti quinti); its tendon fuses with that of the common extensor for the fifth digit. The ulnaris lateralis or extensor carpi ulnaris is a large flat muscle which lies on the lateral surface of the ulna. It arises on the lateral epicondyle of
. The anatomy of the domestic animals . Veterinary anatomy. 374 THE MUSCLES OF THE DOG its tendon divides at or near the carpus into two branches, which are inserted into the third phalanges of the third and fourth digits, blending with the corresponding tendons of the common extensor. The posterior muscle is the extensor of the fifth digit (M. extensor digiti quinti); its tendon fuses with that of the common extensor for the fifth digit. The ulnaris lateralis or extensor carpi ulnaris is a large flat muscle which lies on the lateral surface of the ulna. It arises on the lateral epicondyle of the humerus, and is inserted into the proximal end of the fifth metacarpal and the accessorjr carpal bone. It is chieflj' an abductor of the paw. The flexor carpi ulnaris consists of two quite distinct heads. The larger humeral head arises on the medial epicondyle, while the smaller, superficial ulnar head arises on the posterior border of the ulna. The tendons of the two end on the accessory carpal bone and have a bursa between them. The flexor carpi radialis arises on the medial epicondyle of the humerus and is inserted by a bifid tendon into the second and third metacarpal bones. The tendons of the foregoing eight muscles are provided with synovial sheaths at the carpus. The pronator teres is a fusiform muscle, which is situated superficially on the proximal part of the medial border of the radius. It arises on the medial epicondyle of the humerus, and is inserted into the dorsal surface and medial border of the radius almost half way to the carpus. It is related deeply to the radial vessels, the median nerve, and the tendon of the biceps. Its action is to flex the elbow and rotate the forearm inward (pro- nation). The superficial digital flexor is situated superficially on the medio-volar surface of the forearm. It arises on the inedial epicondyle of the humerus and terminates near the carpus on a tendon which passes downward outside of the carpal canal and receives below t
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