Rotator Cuff Group Joe Muscolino October 30, 2017 Share This Tweet Posterior view of the right rotator cuff group (the subscapularis is not seen). Permission Joseph E. Muscolino. Superior/proximal view of the right rotator cuff muscles. Permission Joseph E. Muscolino. There are four rotator cuff muscles (SITS): Supraspinatus Infraspinatus Teres Minor Subscapularis TRIVIA NOTE: All four rotator cuff muscles attach onto tubercles of the head of the humerus (greater and lesser tubercles). The rotator cuff muscles function primarily to stabilize the head of the humerus into the glenoid fossa of the scapula when the distal end of the humerus is being raised into the air.