Matching Pairs Muscle Actions Part One (D)Online version muscles by Jennifer Jennings 1 pectoralis major 2 rectus abdominis 3 latissimus dorsi 4 trapezius 5 flexor carpi radialis and ulnaris 6 triceps brachii 7 sternocleidomastoid 8 levator scapulae 9 deltoid 10 biceps brachii 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 elbow flexes, adducts, and medially rotates humerus extends and laterally flexes the neck. adducts and medially rotates humerus, extends the shoulder joint elbow flexion, forearm supination. flexes waist and compresses abdominal viscera flexes wrist anteriorly rotates head left and right. bilaterally draws head forward and down.
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