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