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