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