Relier Pairs Muscle Actions Part OneVersion en ligne muscles par Dr. David Myers 1 flexor carpi radialis and ulnaris 2 triceps brachii 3 biceps brachii 4 pectoralis major 5 levator scapulae 6 sternocleidomastoid 7 latissimus dorsi 8 deltoid 9 trapezius 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 flexes waist and compresses abdominal viscera elbow flexion, forearm supination. extends elbow elevates scapula if cervical vertebrae are fixed., flexes neck laterally when scapula is fixed. flexes, adducts, and medially rotates humerus extends and laterally flexes the neck. rotates head left and right. bilaterally draws head forward and down. adducts and medially rotates humerus, extends the shoulder joint
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