Final answer:
Option A. The supraspinatus muscle is the most commonly torn muscle in the rotator cuff, often due to repetitive motions like throwing.
Step-by-step explanation:
The most commonly torn muscle in the rotator cuff is the supraspinatus. This tendon may become damaged due to repetitive overhead motions, such as those performed by baseball pitchers. The rotator cuff is crucial because it secures the head of the humerus within the glenoid cavity of the scapula, providing stability and support for a range of shoulder movements. Injuries to the rotator cuff can result in pain, weakness, and a decrease in the range of motion.
The most commonly torn rotator cuff muscle is the supraspinatus. The rotator cuff is made up of four muscles, including the supraspinatus, infraspinatus, teres minor, and subscapularis. However, the supraspinatus is the muscle that is typically more susceptible to tearing due to its position and function.