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The subject is adducting the shoulders against resistance to demonstrate the pectoralis major muscle.
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The pectoralis major muscle has two parts, the sternocostal and clavicular heads.
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The anterior axillary fold is formed by the inferior border of the sternocostal head of the pectoralis major muscle.
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The axillary fossa (“armpitâ€) is a surface feature overlying a fat-filled space, the axilla.
