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Unformatted text preview: Acts in abduction and lateral tilt (protraction); upper and lower portions of serratus anterior combine with the lower trapezius to form a force couple for upward rotation of scapula; the lower trapezius is more active during shoulder abduction; serratus anterior is more active during shoulder flexion Subclavicus inferior border of clavicle first costal cartilage Acts in stabilization of the sternoclavicular articulation and depression of the shoulder girdle...
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- Spring '10