?:definition
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Either of two large muscles of the anterior chest wall, which has two heads: the clavicular head, which originates on the medial half of the clavicle, and the sternal head, which originates on the sternum and the first six costal cartilages; the muscles insert onto the lateral lip of the intertubercular groove of the humerus and the crest of the greater tubercle of the humerus respectively; primary function is flexion, adduction, and medial rotation of the shoulder joint.
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