Which of the following muscles abducts the arm?Multiple choice question.supraspinatussubscapularisinfraspinatustrapezius

To determine which muscle abducts the arm among the given options, we can analyze each muscle's function:

1. Supraspinatus: This muscle is part of the rotator cuff and is primarily responsible for initiating arm abduction (lifting the arm away from the body).

2. Subscapularis: This muscle is also part of the rotator cuff but is primarily involved in arm internal rotation, not abduction.

3. Infraspinatus: This muscle is primarily responsible for external rotation of the arm and does not play a significant role in abduction.

4. Trapezius: While the trapezius muscle assists in shoulder movement and stabilization, it does not primarily abduct the arm.

Final Answer

The muscle that abducts the arm is supraspinatus.