. Cunningham's Text-book of anatomy. Anatomy. 380 THE MUSCULAK SYSTEM. Supraspinatus (insertion) . Subscapularis (insertion) Pectoralis major (insertion) Latissimus dorsi (insertion) Triceps : lateral head (origin) Nerve-Supply. The nerve to the coracobrachialis comes from the 7th or 6th and 7th cervical nerves, incorporated with the musculo-cutaneous, the nerve separates to supply the muscle before the latter nerve pierces it. Action.—The muscle assists the biceps to raise the arm and draw it medially. M. Biceps Brachii.—The biceps brachii arises by two tendinous heads. (1) The short head (ca
. Cunningham's Text-book of anatomy. Anatomy. 380 THE MUSCULAK SYSTEM. Supraspinatus (insertion) . Subscapularis (insertion) Pectoralis major (insertion) Latissimus dorsi (insertion) Triceps : lateral head (origin) Nerve-Supply. The nerve to the coracobrachialis comes from the 7th or 6th and 7th cervical nerves, incorporated with the musculo-cutaneous, the nerve separates to supply the muscle before the latter nerve pierces it. Action.—The muscle assists the biceps to raise the arm and draw it medially. M. Biceps Brachii.—The biceps brachii arises by two tendinous heads. (1) The short head (caput breve) is attached in common with the coracobrachialis to the tip of the cora-" coid process of the scapula (Fig. 333, p. 372). Concealed by the deltoid and tendinous at first, this head forms a separate fleshy belly, which is united to the long head by an invest- ment of the deep fascia. (2) The long head (caput longum) arises by a round tendon from the supra- glenoidal tuberos- ity at the root of the coracoid pro- cess and from the labrum glenoidale on either side. Its tendon passes through the cavity of the shoulder- joint, and emerg- ing from the cap- sule beneath the transverse humeral ligament (invested by a prolongation of the synovial membrane), it occupies the inter- tubercular groove of the humerus Deltoid "(insertion) Coracobrachialis (insertion) Deltoid (insertion) Brachioradialis "(origin) Extensor carpi -radialis longus gin) Common tendon for origin of . pronator teres and flexor muscles of forearm Common tendon for origin of extensor muscles of forearm Fig. 340.—Muscle - Attachments to the Anterior Aspect of the Right Common tendon for origin of extensormuscles covereH by a fascial prolongation of the tendon of the pec- toralis major. In Fig. 341.—Muscle - Attachments to the arm it forms a the Posterior Surface of the flegl b R united Eight Humerus. , •> , y , „ to that derived irom the short head by an envelope of deep
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