. Comparative anatomy. Anatomy, Comparative. THE MUSCULAR SYSTEM 2«I thoracic cavity is enlarged. The curvature of the diaphragm is restored when the intercostal muscles relax and the abdominal muscles push the viscera against the diaphragm. Shoulder and Chest Muscles. The muscles of the shoulder and chest function chiefly in relation to the arms. The most superficial of these on the back is the trapezius which elevates the shoulder and in conjunction with the rhomboideus draws the shoulder blade towards the backbone. Underneath the trapezius, the rhomboideus major and minor also draw the sho
. Comparative anatomy. Anatomy, Comparative. THE MUSCULAR SYSTEM 2«I thoracic cavity is enlarged. The curvature of the diaphragm is restored when the intercostal muscles relax and the abdominal muscles push the viscera against the diaphragm. Shoulder and Chest Muscles. The muscles of the shoulder and chest function chiefly in relation to the arms. The most superficial of these on the back is the trapezius which elevates the shoulder and in conjunction with the rhomboideus draws the shoulder blade towards the backbone. Underneath the trapezius, the rhomboideus major and minor also draw the shoulder blade towards the backbone. The deltoideus is the shield- shaped muscle which covers the shoulder and extends from the scapula to M. TRANSVERSOSPINALIS. TRANSVERSE PROCESS. M QUADRATUS LUMBORLM ,-M LDNGISSIMUS OORSI. M RHOMBOIDEUS. â¢M. SERRATUS POSTERIOR. ^SCAPULA. M. LATISSIMUS DORSI. GLENOID M. EXTER^4AL OBLIQUE. M. RECTUS ABDOMINIS^ 'ACROMION. tORACDID. -â M. SUBCLAVIUS. M. BRACHIALIS' PECTORALIS MAJOR. INFERIOR. M. TRANSVERSUS THORACIS. MANLBRIUM STERNi; CLAVICLE-; Fig. 234.âThoracic and lumbar muscles of man as seen in cross section. Thoracic muscles on the right, lumbar on the left. (Redrawn after Braus.) the humerus. Its chief function is to abduct the arm. The supra- spinatus and infraspinatus muscles on the dorsal side of the scapula together with the teres minor help to rotate the arm. On the under surface of the scapula the subscapularis is an inward rotator. The teres major muscle adducts the arm towards the body. The latissimus dorsi is a broad muscle, inserted on the humerus, which draws the arm down and backward. In the region of the chest, the pectoralis major and minor are the chief muscles. They adduct the arm. The subclavius is a small muscle connecting the clavicle with the first rib, used in depressing the clavicle. The serratus anterior extends from the scapula to the first nine ribs and draws the shoulder forward. Muscles of the Uppe
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Keywords: ., bookcentury1900, bookpublisherphi, booksubjectanatomycomparative
