In this video I show the 4 rotator cuff muscles as well as the Teres major. Subscapularis Sub (L) under, below Scapul, =a (L) The shoulder blade Origin – Anterior surface of scapula Insertion – Lesser tubercle humerus Action – Medial or internal rotation of humerus Supraspinatus Supra (L). Above, over, beyond Spin, =a, -i […]