Which of the following muscles is NOT part of the rotator cuff?

• A. Deltoid
• B. Infraspinatus
• C. Supraspinatus
• D. Teres minor

Answer: (A)

Verified step by step guidance

1. Step 1: Understand the rotator cuff muscles. The rotator cuff is a group of four muscles that stabilize the shoulder joint. These muscles are Supraspinatus, Infraspinatus, Teres minor, and Subscapularis.
2. Step 2: Identify each muscle listed in the problem. The options are Deltoid, Infraspinatus, Supraspinatus, and Teres minor.
3. Step 3: Compare each muscle to the known rotator cuff muscles. Infraspinatus, Supraspinatus, and Teres minor are all part of the rotator cuff group.
4. Step 4: Recognize that the Deltoid muscle is not part of the rotator cuff. Instead, the Deltoid is a large muscle responsible for lifting the arm and giving the shoulder its rounded contour.
5. Step 5: Conclude that the muscle NOT part of the rotator cuff from the given options is the Deltoid.