Rotator Cuff Injury, affecting the ‘..group of muscles and their tendons that act to stabilize the shoulder. Of the seven scapulohumeral muscles, four make up the rotator cuff. The four muscles are the supraspinatus muscle, the infraspinatus muscle, teres minor muscle, and the subscapularis muscle.’

Excerpt from: https://en.wikipedia.org/wiki/Rotator_cuff