Which muscle is primarily responsible for the initiation of abduction of the arm in the frontal plane____________________?
Correct answer: B. Supraspinatus
- A. Infraspinatus
- B. Supraspinatus
- C. Teres major
- D. Subscapularis
Explanation
The supraspinatus initiates the first part of arm abduction, after which the deltoid becomes the main mover. The other listed rotator-cuff or shoulder muscles primarily rotate or adduct the arm.
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