Which part of the Deltoid is associated with extension and lateral rotation of the shoulder?

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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

Which part of the Deltoid is associated with extension and lateral rotation of the shoulder?

Explanation:
The posterior portion of the deltoid is responsible for extending the shoulder and rotating the arm laterally. Its fibers run backward from the spine of the scapula to the humerus, so when they contract they pull the arm backward (extension) and turn the humeral head outward (lateral/external rotation). The other parts have different roles: the anterior fibers flex and medially rotate, while the middle fibers primarily abduct. Thus, extension and lateral rotation fit best with the posterior deltoid.

The posterior portion of the deltoid is responsible for extending the shoulder and rotating the arm laterally. Its fibers run backward from the spine of the scapula to the humerus, so when they contract they pull the arm backward (extension) and turn the humeral head outward (lateral/external rotation). The other parts have different roles: the anterior fibers flex and medially rotate, while the middle fibers primarily abduct. Thus, extension and lateral rotation fit best with the posterior deltoid.

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