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