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