ACSM Certified Personal Trainer (CPT) — Question 21

Which rotator cuff muscle abducts the arm?

Answer options

• A. Infraspinatus
• B. Supraspinatus
• C. Subscapularis
• D. Medial deltoid

Correct answer: B

Explanation

The Supraspinatus is the rotator cuff muscle that initiates the abduction of the arm by helping to lift it away from the body. The Infraspinatus and Subscapularis are involved in arm rotation, while the Medial deltoid is primarily responsible for arm abduction but is not a rotator cuff muscle.