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