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