What action is performed by the anterior fibers of the deltoid?

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Study for the Muscle Actions and Functions – Anatomy and Movement Test. Equip yourself with multiple choice questions, each with detailed explanations and hints. Prepare confidently for your exam!

Multiple Choice

What action is performed by the anterior fibers of the deltoid?

Explanation:
The front (anterior) portion of the deltoid pulls the arm forward and toward the midline. When it contracts, it flexes the shoulder joint and medially rotates the humerus, which is the action you’d feel when lifting the arm in front of you or bringing the palm toward the body. This contrasts with the middle fibers, which lift the arm out to the side (abduction), and the back fibers, which extend and laterally rotate the arm. Retraction, or pulling the scapula back, isn’t a primary action of the deltoid’s anterior fibers.

The front (anterior) portion of the deltoid pulls the arm forward and toward the midline. When it contracts, it flexes the shoulder joint and medially rotates the humerus, which is the action you’d feel when lifting the arm in front of you or bringing the palm toward the body. This contrasts with the middle fibers, which lift the arm out to the side (abduction), and the back fibers, which extend and laterally rotate the arm. Retraction, or pulling the scapula back, isn’t a primary action of the deltoid’s anterior fibers.

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