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Intertubercular groove muscles
This group of important prime movers of the shoulder joint shares numerous structural and functional features in common. During development two of the muscles, the pectoralis major and latissimus dorsi, migrated back onto the trunk wall to increase their mechanical efficiency and leverage at the shoulder joint. These are the two largest muscles of the superior limb. Functionally, all the muscles of the intertubercular groove are powerful adductors and medial rotators of the humerus. In addition, all of the muscles, as the name suggests, attach to the intertubercular groove of the humerus. The muscles also form the anterior and posterior walls of the axilla, or armpit. The large pectoralis major forms the anterior wall of the axilla, while the sheet-like latissimus dorsi and thick, round teres major form the posterior axillary wall.