. Text-book of anatomy and physiology for nurses. in other words, the bicepsmay act as both a supinator and flexor. The coraco-brachialis.—A smallermuscle, close to the biceps. Origin.—The tip of the coracoid process. In-sertion.—The shaft of humerus, medialside, opposite the deltoid. Action.—It lifts the humerus for-ward. Nerve.—Musculo-cutaneous. The brachialis.—Is underneath thebiceps. Origin.—The anterior surfaceof the humerus. Insertion.—The tuber-cle of the ulna, just below the coronoidprocess. Action,—With the biceps it flexesthe forearm. Note.—This is a broad muscle andcovers the front
. Text-book of anatomy and physiology for nurses. in other words, the bicepsmay act as both a supinator and flexor. The coraco-brachialis.—A smallermuscle, close to the biceps. Origin.—The tip of the coracoid process. In-sertion.—The shaft of humerus, medialside, opposite the deltoid. Action.—It lifts the humerus for-ward. Nerve.—Musculo-cutaneous. The brachialis.—Is underneath thebiceps. Origin.—The anterior surfaceof the humerus. Insertion.—The tuber-cle of the ulna, just below the coronoidprocess. Action,—With the biceps it flexesthe forearm. Note.—This is a broad muscle andcovers the front of the elbow-joint. Nerve. — Musculo-cutaneous andradial. Arm Muscles (Fig. 79). triceps brachii (a three-headed muscle). Origin.—Thelong head, on the scapula, justbelow the glenoid fossa,; the medialand lateral heads on the posteriorsurface of the humerus, separatedby the groove for the radial —The (top of the)olecranon process of the ulna. Action.—It extends the forearmNerve.— S. Fig. 81.—Muscles of the , 2, 3, 5, Biceps and bicipital fascia;4, attachment of biceps to tuberosity ofradius; 6, coracobrachialis; 7, 8, inser-tion of pectoralis major; 9, latissimusdorsi (insertion); 10, teres major; 11,subsca pularis; 12, brachialis; i^, 14,two heads of triceps.—(Holden.) (opposing the biceps). gS ANATOMY AND PHYSIOLOGY FOR NURSES. Note.—The back of the triceps is covered at its lower portion by a fibrouslayer (aponeurosis) which receives many of the muscular fibers. In action,the three heads swell while this fibrous layer remains flat. Muscles of the The superficial flexors.—The medial epicondyle of the humerus gives origin to a group of superficial muscles which flex the wrist andfingers (Fig. 82). Flexor carpi radialis, or radialJiexor of the wrist. Origin.—The medial epicondyle. Insertion.—The base of the secondmetacarpal bone (that of the index-finger). Nerve.—Med
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