- The teres major attaches from the inferior angle and inferior lateral border of the scapula to the medial lip of the bicipital groove of the humerus.
- Medially rotates the arm at the glenohumeral joint
- Adducts the arm at the glenohumeral joint
- Extends the arm at the glenohumeral joint
- The teres major has the same glenohumeral joint actions as the latissimus dorsi (medial rotation, adduction, and extension). Fo this reason, some sources refer to the teres major as the helper to the latissimus dorsi.
- The latissimus dorsi and teres major comprise the posterior axillary fold of tissue.