What movement does the subscapularis primarily perform?

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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 movement does the subscapularis primarily perform?

Explanation:
Subscapularis sits on the anterior surface of the scapula and is one of the rotator cuff muscles that stabilize the shoulder. Its fibers pull the humeral head medially (internal rotation) and help keep the head of the humerus seated in the glenoid, acting as an anterior stabilizer during arm movements. That’s why internal (medial) rotation of the humerus with anterior shoulder stabilization is the primary action. External rotation is mainly the job of the infraspinatus and teres minor; abduction is driven by the supraspinatus and deltoid; extension involves muscles like the latissimus dorsi, teres major, and posterior deltoid.

Subscapularis sits on the anterior surface of the scapula and is one of the rotator cuff muscles that stabilize the shoulder. Its fibers pull the humeral head medially (internal rotation) and help keep the head of the humerus seated in the glenoid, acting as an anterior stabilizer during arm movements.

That’s why internal (medial) rotation of the humerus with anterior shoulder stabilization is the primary action. External rotation is mainly the job of the infraspinatus and teres minor; abduction is driven by the supraspinatus and deltoid; extension involves muscles like the latissimus dorsi, teres major, and posterior deltoid.

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