Anatomy Muscle Actions (Muscles of the neck, shoulder and thorax/ upper arm muscles)
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Extends head; raises, rotates, and retracts (adducts) scapula
Prime mover of arm extension
lateral rotation of humerus
Extends, medially rotates, and adducts humerus; synergist of latissimus dorsi
Assist abduction of humerus
Elevates and adducts scapula; flexes neck
Powerful forearm muscle extensor; antagonist of forearm flexors
Flexion (powerful) of elbow and supination of forearm
Synergist in forearm flexion
Major flexor of forearm
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