Among the following, which is NOT a shoulder joint adductor?

The supraspinatus is primarily a shoulder joint abductor rather than an adductor. It plays a significant role in initiating shoulder abduction, which involves moving the arm away from the body. It is one of the four rotator cuff muscles and its main function is to stabilize the head of the humerus in the glenoid cavity of the scapula, allowing for proper shoulder movement.

In contrast, the pectoralis major, latissimus dorsi, and teres major are all shoulder joint adductors. The pectoralis major assists with bringing the arm towards the body in addition to being responsible for flexion and internal rotation. The latissimus dorsi contributes to adduction, extension, and internal rotation of the shoulder. Similarly, the teres major aids in adducting the arm and is involved in internal rotation. Hence, the supraspinatus stands out as the muscle that does not perform adduction at the shoulder joint.