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