Which muscle primarily abducts the arm at the shoulder?

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Multiple Choice

Which muscle primarily abducts the arm at the shoulder?

Explanation:
Abduction at the shoulder means lifting the arm out to the side away from the body. The deltoid, especially its middle fibers, is the main mover for this action, providing the bulk of the lifting force through most of the range. The initial lift begins with the supraspinatus, but after that the deltoid takes over as the primary abductor. The other muscles listed have different roles: latissimus dorsi pulls the arm downward and inward, pectoralis major adducts and rotates the arm inward, and trapezius mainly moves and stabilizes the shoulder blade.

Abduction at the shoulder means lifting the arm out to the side away from the body. The deltoid, especially its middle fibers, is the main mover for this action, providing the bulk of the lifting force through most of the range. The initial lift begins with the supraspinatus, but after that the deltoid takes over as the primary abductor. The other muscles listed have different roles: latissimus dorsi pulls the arm downward and inward, pectoralis major adducts and rotates the arm inward, and trapezius mainly moves and stabilizes the shoulder blade.

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