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