What muscles are included in the rotator cuff?

The muscles included in the rotator cuff are indeed the subscapularis, infraspinatus, teres minor, and supraspinatus, collectively referred to as SITS. This group plays a crucial role in the stability and movement of the shoulder joint. Each of these muscles originates from the scapula and inserts into the humerus, providing essential support for shoulder functions such as arm elevation, rotation, and stabilization during various activities.

The subscapularis muscle is primarily responsible for internal rotation of the arm. The infraspinatus and teres minor contribute to external rotation, while the supraspinatus initiates abduction of the arm. Together, these muscles form a cuff around the shoulder joint that protects it and enables a wide range of movement.

The other options listed do not accurately represent the rotator cuff. The biceps and triceps are primarily elbow flexors and extensors, not part of the rotator cuff. The deltoid and trapezius have different functions in shoulder movement and stability. Similarly, the latissimus dorsi and pectoralis major are larger muscles associated with movements like adduction and extension of the shoulder but are not involved in the stabilizing role of the rotator