ARTHROLOGY 



63 



tend from the processus styloideus of the uhia to the tuberculum 

 posterius carpi uhiaris of the os carpi ulnaris. 



The ligamentum posticum ulnare carpi ulnaris extends from the 

 processus styloideus of the ulna to the os carpi ulnaris. 



Fig. 15. — Ligaments of the arm and forearm of a hen. 



A. The scapulo-coraco-humeral articulation, i. Proximal end of the humerus. 



2, Articular head of humerus. 3, The coracoid. 4, Proximal end of the clavicle. 

 5, Tendon of pectoralis tertius. 6, Tendon of pectoralis secundus. 7, Opening 

 or foramen triossium through which the tendon of the elevator of the wing 

 passes. (Pectoralis secundus. 8, Broken end of scapula. 



B. I, Ligamentum transversum. 2, Ligamentum laterale cubiti externum. 



3, Ligamentum annulare radii. 4, Ligamentum cubiti teres. 5, A portion of 

 the ligamentum capsulare cubiti. 6, Distal extremity of humerus. 7, Ulna. 

 8, Radius. 



C. Muscles of the outside surface of the arm. i, Tensor patagii longus. 2, 

 Extensor digitorum communis. 3, Tensor patagii brevis. 4, Anconeus. 5, 

 Plexor carpi ulnaris. 6, Biceps. 7, Triceps. 8. Deltoid. 9, Brachialis anticus. 

 10, Flexor metacarpi radialis. 11, Extensor ossis metacarpi pollicis. 12, Ex- 

 tensor metacarpi radialis longior. 13, Extensor indicis longus. 



The ligamentum ulnare carpi radialis is a short ribbon-like ligament 

 which passes over the above-mentioned ligaments and is attached 

 to the inner surface of the os carpus radialis. 



The ligamentum ulnare carpi radialis internum is a strong ligament 



