The anterior fibers of the deltoid perform which actions?

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Multiple Choice

The anterior fibers of the deltoid perform which actions?

Explanation:
The front part of the deltoid pulls the arm forward and inward. Specifically, these fibers flex the shoulder (lift the arm in front), medially rotate the humerus (turn the arm toward the midline), and horizontally adduct the shoulder (move the arm across the chest when the shoulder is flexed). This combination of actions is unique to the anterior deltoid, whereas the middle fibers mainly abduct the arm and the posterior fibers extend and laterally rotate it. So, the set of movements described—flexion, internal rotation, and horizontal adduction—best matches what the anterior deltoid does.

The front part of the deltoid pulls the arm forward and inward. Specifically, these fibers flex the shoulder (lift the arm in front), medially rotate the humerus (turn the arm toward the midline), and horizontally adduct the shoulder (move the arm across the chest when the shoulder is flexed). This combination of actions is unique to the anterior deltoid, whereas the middle fibers mainly abduct the arm and the posterior fibers extend and laterally rotate it. So, the set of movements described—flexion, internal rotation, and horizontal adduction—best matches what the anterior deltoid does.

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