THE MUSCLES OF THE SHOULDER 



301 



Relations. —LaieTSiWy, the subscapularis, the brachiahs, the tendon of insertion 

 of the latissimus dorsi, and the humerus; medially, the deep pectoral; in front, 

 the biceps brachii. The anterior circumflex artery and the nerve to the biceps 

 pass between the two parts, or between the muscle and the bone, and the brachial 

 vessels lie along the posterior border of the muscle. 



Latissi, 



Teres major 



Tensor fascim antibrachii. 



Deep fascia of forearm 



Subscapularis 



Vnttriur deep pectoral 



':'■''/■ Siipraspiniitus 



'4. 



Posterior deep 

 pectoral 



Corn co-brach ialis 

 Biceps brachii 



Extensor carpi radialis 



Brachiulis 



Long medial ligament of elbow 



Fig. 277. — Muscleb of Shoulder and Abm of Horse; Medial View. 

 1, Long head of triceps brachii; 2, medial head of triceps; 3, distal end of humerus. 



Blood-supply. — Anterior circumfiex artery. 

 Nerve-supply. — Musculo-cutaneous nerve. 



4. Capsularis.^ — This is a very small muscle, which lies on the flexion surface 

 of the capsule of the shoulder joint. 



' Also known as the scapulo-humeralis posticus s. gracilis. 



