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