GROSS ANATOMY

Detailed explanation-1: -The greater tubercle attaches muscles and ligaments to the uppermost part of the humerus to the rotator cuff. The lesser tuberble is on the opposite side of the greater tubercle to help attach the rotator cuff muscle to the shoulder. The lesser tubercle is much smaller than the greater tubercle.

Detailed explanation-2: -The infraspinatus and teres minor insert on the greater tubercle, and work to laterally, or externally, rotate the humerus. In contrast, the subscapularis muscle inserts onto the lesser tubercle and works to medially, or internally, rotate the humerus.

Detailed explanation-3: -The greater tubercle is the most lateral bony point of the humerus and is palpable at the posterolateral aspect of the shoulder. The superior aspect of the greater tubercle is marked by three impressions that serve as attachment points for the supraspinatus, infraspinatus and teres minor muscles.