. Text-book of anatomy and physiology for nurses. Fig. 79.—Muscles of the , 2, 3, 4, 5, Triceps; 6, attachment toolecranon; 7, anconeus; 8, 8, g, deltoid (por-tion removed); 10, supraspinatus; 11, infra-spinatus; 12, 13, two extremities of teresminor (intervening portion removed); 14,teres major; 15, latissimus dorsi; 16, 17, 18,19, musclesof forearm.— (Goulds Dictionary.) c)6 anatomy and physiology for nurses. Breast Muscles. Pectoralis major. Origin.—Clavicular portion, on the sternalend of the clavicula; sternal portion, on the surface of the sternumand on six upper ribs. Insertio
. Text-book of anatomy and physiology for nurses. Fig. 79.—Muscles of the , 2, 3, 4, 5, Triceps; 6, attachment toolecranon; 7, anconeus; 8, 8, g, deltoid (por-tion removed); 10, supraspinatus; 11, infra-spinatus; 12, 13, two extremities of teresminor (intervening portion removed); 14,teres major; 15, latissimus dorsi; 16, 17, 18,19, musclesof forearm.— (Goulds Dictionary.) c)6 anatomy and physiology for nurses. Breast Muscles. Pectoralis major. Origin.—Clavicular portion, on the sternalend of the clavicula; sternal portion, on the surface of the sternumand on six upper ribs. Insertion.—By a broad strong tendonon the shaft of the humerus, on the crest of the greater 74, 80. iff 9-1. —13 4-i^ I as 10 n Fig. 80.—Muscles of Anterior Aspect of , Pectoralis major; 6, 9, pectoralis minor; 7, subclavius; 8, deltoid; 10, anteriorportion of anterior serratus; 11, external oblique; 12,13, latissimus dorsi; 14, teres major.—(Goulds Dictionary.) Action.—It draws the arm to the front of the thorax, opposingthe latissimus dorsi; thus it also is a rowingmuscle. The pectoralis minor is entirely covered by the major. Origin.—Three upper ribs. Insertion.—The coracoid process of thescapula. Action.—It pulls the shoulder downward. It may pull ribs upwardin labored breathing or forced inspiration. Nerves of both muscles.—Anterior thoracic. Note.—When the whole body is drawn upward by the hands, aswhen hanging from a trapeze, the two pectorals, the trapezius and thelatissimus are acting together. The subclavius is a small muscle lying in the subclavian groove betweenthe clavicle and first rib. It may elevate the ribs or depress the clavicle. Arm Muscles. An
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