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The rotator cuff is a group of muscles in the shoulder that allow a wide range of movement while maintaining the stability of the glenohumeral joint (see Image. Rotator Cuff Muscles). The rotator cuff includes the following muscles: Subscapularis Infraspinatus Teres minor Supraspinatus (see Image. Rotator Cuff Muscles Anatomy) [1][2][3] A helpful mnemonic to remember these muscles is "SITS". The glenohumeral joint is a ball-and-socket joint and comprises a large spherical humeral head and a small glenoid cavity. This anatomy makes the joint highly mobile; however, it is also really unstable. Stabilization in the shoulder is provided collectively by the non-contractile tissue of the glenohumeral joint (static stabilizers), such as the capsule, the labrum, the negative intraarticular pressure, and the glenohumeral ligaments, and the contractile tissues (dynamic stabilizers), such as the rotator cuff muscles and the long head of the biceps brachii. See Image. Muscles and Fascia of the Shoulder.