Relier Pairs Muscle Actions Part OneVersion en ligne muscles par Dr. David Myers 1 pectoralis major 2 deltoid 3 rectus abdominis 4 sternocleidomastoid 5 triceps brachii 6 levator scapulae 7 flexor carpi radialis and ulnaris 8 biceps brachii 9 trapezius 10 latissimus dorsi extends and laterally flexes the neck. extends elbow ant. fibers flex and medially rotate arm, lat. fibers abduct the arm, post. fibers extend and laterally rotate the arm 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. adducts and medially rotates humerus, extends the shoulder joint elbow flexion, forearm supination. flexes waist and compresses abdominal viscera flexes wrist anteriorly flexes, adducts, and medially rotates humerus
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