Internal Rotators of the Shoulder Wheeless

Description: 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;
Wheeless' Textbook of Orthopaedics