Relier Pairs Muscle Actions Part One (D)Version en ligne muscles par Jennifer Jennings 1 latissimus dorsi 2 pectoralis major 3 flexor carpi radialis and ulnaris 4 trapezius 5 biceps brachii 6 triceps brachii 7 sternocleidomastoid 8 deltoid 9 rectus abdominis 10 levator scapulae adducts and medially rotates humerus, extends the shoulder joint flexes waist and compresses abdominal viscera flexes, adducts, and medially rotates humerus elevates scapula if cervical vertebrae are fixed., flexes neck laterally when scapula is fixed. ant. fibers flex and medially rotate arm, lat. fibers abduct the arm, post. fibers extend and laterally rotate the arm extends and laterally flexes the neck. rotates head left and right. bilaterally draws head forward and down. flexes wrist anteriorly elbow flexion, forearm supination. extends elbow
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