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- Discussion:
    - major internal rotators are teres major, latissimus, pect major;
    - latissimus dorsi & teres major insert along medial lip of bicipital groove & pectoralis major along lateral lip and also serve as internal rotators;
    - these muscles comprise larger mass than those that externally rotate the humerus which explains greater power of internal rotation;
    - internal rotators are supplied by nerves which arise directly from the brachial plexus