. The anatomy of the domestic animals. Veterinary anatomy. FLEXOR DIVISION 315 and nerve; deeply, to the humeral head of the deep flexor. The tendon is re- lated superficially to the skin and fascia; deeply, to the deep flexor tendon. Blood-supply.—Median artery. Nerve-supply.—Ulnar and median nerves. 5. Deep digital flexor' (M. flexor digitalis profundus).—The fleshy part of this muscle lies on the posterior surface of the radius, and is almost entirely under cover of the preceding muscles. It is the largest muscle of the flexor group. Origin.—(1) The medial epicondyle of the humerus; (2) the
. The anatomy of the domestic animals. Veterinary anatomy. FLEXOR DIVISION 315 and nerve; deeply, to the humeral head of the deep flexor. The tendon is re- lated superficially to the skin and fascia; deeply, to the deep flexor tendon. Blood-supply.—Median artery. Nerve-supply.—Ulnar and median nerves. 5. Deep digital flexor' (M. flexor digitalis profundus).—The fleshy part of this muscle lies on the posterior surface of the radius, and is almost entirely under cover of the preceding muscles. It is the largest muscle of the flexor group. Origin.—(1) The medial epicondyle of the humerus; (2) the medial surface of the olecranon; (3) the midtUe of the posterior surface of the radius and a small ad- jacent area of the ulna. Insertion.—The semilunar crest and the adjacent surface of the cartilage of the third phalanx. Action.—To flex the digit and carpus and to ex-tend the cIIdow. Structure.—This muscle consists of three heads. The humeral head (Caput humerale) constitutes the bulk of the muscle. It is marked liy tendinous inter- sections, and is separable into three secondary heads. A synovial pouch from the elbow joint descends under its origin about two inches. The Tendon of Tendon of ulnar head (Caput ulnare) is lateral extensor conunon extensor much smaller, and is at first \ superficially situated between the lateral and middle flexors of the carpus. The radial head (Caput radiale) is the smallest, and is not always present; it is situated on the distal two- thirds of the posterior surface of the radius, under the humer- al head. Each of these heads is provided with a tendon. The principal tendon—that of the humeral head—begins about three or four inches (8-10 cm.) above the carpus and is joined at the carpus by the tendons of the other two heads. The conjoined tendon passes tlownward through the carpal canal, being included in the carpal sjmovial sheath -ndth the superficial flexor ten- tlon, as previously described. The tendon is at flrst broad a
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