. The anatomy of the domestic animals. Veterinary anatomy. 364 THE MUSCLES OF THE PIG digit. (2) The small volar muscle is the extensor digiti quinti proprius; it ends by a long tendon on the lateral aspect of the fifth digit. The supinator, when present, is a pale, thin muscular slip wliich arises on the lateral border of the radius just above the interosseous space, extends medially and downward across the dorsal surface of the bone to its medial border, where it l^lends with the ratlial head of the deep flexor. The pronator teres is a delicate, fusiform muscle which lies along the medial su
. The anatomy of the domestic animals. Veterinary anatomy. 364 THE MUSCLES OF THE PIG digit. (2) The small volar muscle is the extensor digiti quinti proprius; it ends by a long tendon on the lateral aspect of the fifth digit. The supinator, when present, is a pale, thin muscular slip wliich arises on the lateral border of the radius just above the interosseous space, extends medially and downward across the dorsal surface of the bone to its medial border, where it l^lends with the ratlial head of the deep flexor. The pronator teres is a delicate, fusiform muscle which lies along the medial surface of the elbow and proximal part of the forearm. It arises from the medial epicondyle and collateral ligament of the elbow and is inserted by a thin tendon to the medial Ijorder of the radius about its middle. The flexor carpi radialis is well developed. It arises on the medial ei)icondylo of the humerus, and is inserted into the third metacarpal bone. The flexor carpi ulnaris is narrow and has no ulnar head. It runs oljliquely down the back of the forearm in the furrow between the superficial and deep flexors of the digit. It arises from the medial epicondyle of the humerus and ends on the accessory carpal bone. The ulnaris lateralis (M. extensor carpi ulnaris) is covered by a tendinous band, which is a thickened part of the fascia of the forearm and extends from the lateral epicondyle to the accessor}^ carpal bone and lateral aspect of the carpus. The belly of the muscle is round: its ten- don of insertion perforates this bantl in the distal part of the forearm and ends on the proximal end of the fifth metacarpal bone. The superficial digital flexor arises from the medial epicondyle of the humerus and consists of two parts. The tendon of the superficial head passes down behind the pos- terior annular ligament of the carpus (bound down by a special annular ligament), forms a ring at the fetlock for a tendon of the deep flexor, and ends by two branches on the second phalanx
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