Which of the following is NOT a rotator cuff muscle?

The latissimus dorsi muscle is the correct answer because it is not classified as a rotator cuff muscle. The rotator cuff consists of four specific muscles: the supraspinatus, infraspinatus, teres minor, and subscapularis. These muscles work together to stabilize the shoulder joint, supporting its mobility and allowing for a wide range of arm movements.

The supraspinatus and infraspinatus are essential for shoulder stability and play significant roles in arm elevation and external rotation, respectively. The subscapularis, positioned on the anterior aspect of the shoulder blade, facilitates internal rotation. In contrast, the latissimus dorsi is a large muscle that extends from the lower back to the humerus and primarily functions in arm adduction, extension, and internal rotation. Its location and function distinguish it from the rotator cuff muscles, which are crucial for fine motor control and stabilization of the shoulder joint during dynamic movements.