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The rotator cuff in the shoulder is comprised of a group of four specific muscles and their associated tendons that play a crucial role in shoulder stability and movement. These are the supraspinatus, infraspinatus, teres minor, and subscapularis.

The supraspinatus muscle is located at the top of the shoulder and is responsible for aiding in arm abduction. The infraspinatus is situated below it and assists in external rotation of the shoulder. The teres minor is located just below the infraspinatus, also contributing to external rotation and stabilization of the shoulder joint. Lastly, the subscapularis is positioned at the front of the shoulder and allows for internal rotation of the arm. Together, these muscles work synergistically to provide dynamic stability to the shoulder, especially during overhead activities.

The other options listed consist of muscles that are not part of the rotator cuff group. For instance, the deltoid is a primary shoulder muscle but does not contribute to the rotator cuff. Trapezius, latissimus dorsi, and pectoralis major have different roles in shoulder movement. Thus, understanding the specific composition of the rotator cuff is essential for identifying shoulder function