. The anatomy of the domestic animals . Veterinary anatomy. 226 THE ARTICULATIONS OF THE HOESB considerable elasticity, and is the highly modified interosseous medius muscle. It consists mainly of tendinous tissue, but contains a variable amount of striped mus- cular tissue, especially in its deep part and in young subjects. Its principal func- tion is to support the fetlock, i. e., to prevent excessive dorsal flexion of the joint when the weight is put on the limb. The branches which join the common exten- sor tendon limit volar flexion of the interphalangeal joints in certain phases of move-
. The anatomy of the domestic animals . Veterinary anatomy. 226 THE ARTICULATIONS OF THE HOESB considerable elasticity, and is the highly modified interosseous medius muscle. It consists mainly of tendinous tissue, but contains a variable amount of striped mus- cular tissue, especially in its deep part and in young subjects. Its principal func- tion is to support the fetlock, i. e., to prevent excessive dorsal flexion of the joint when the weight is put on the limb. The branches which join the common exten- sor tendon limit volar flexion of the interphalangeal joints in certain phases of move- ment. The distal sesamoidean ligaments are three in number. The superficial or Large metacarpal bone Lateral small metacarpal hone Bifurcation nf co»imon digital artery Medial digital artery Oblique or middle distal sesamoid ligament Straight or superficial distal sesamoid ligament Distal annular ligament of digit {cut and reflected). Bifurcation of suspensory ligament Capsule of fetlock joint {proximal pouch) Sesamoid groove Volar annular ligament of fetlock {cut and reflected) Lateral sesamoid ligament Stump of proximal digital annular ligament Extensor branch of suspensory ligament Volar ligaments of pastern joint Insertion of superficial flexor tendon Fibrous plate Deep flexor tendon Lateral ligament of pastern joint _^ _^ ^ Distal end of digital sheath ^ Suspensory ligament of navicular ':'^rT bone Dorsal branch of digital artery Volar branch of digital artery Fig. 241.—Deep Dissection of Distal Part of Right Fore Limb of Horse, Showing Joints and Ligaments; Posterior View. 1, Cartilage of third phalanx; 2, surface of na\dcular bone; 3, distal navicular ligament; 4, insertion of deep flexor tendon. Small arrows point to openings made in capsules of pastern and coffin joints. (After Schmaltz, Atlas d. Anat. d. Pferdes.) straight sesamoidean ligament (Lig. sesamoideum rectum) is a flat band and is somewhat witler above than below.^ It is attached above to the bas
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