The 4 of scapulohumeral muscles, viz. supraspinatus infraspinatus, teres minor, and subscapularis (frequently called SITS muscles) are termed rotator cuff muscles for they form musculotendinous/rotator cuff around the glenohumeral joint.
Interactive Anatomical Interface
Tendon of supraspinatus fuse superiorly, tendons of infraspinatus and teres minor fuse posteriorly, and that of subscapularis fuse anteriorly. This cuff has a significant role in stabilizing the shoulder joint.