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