Which rotator cuff muscle is the primary internal rotator?

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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 rotator cuff muscle is the primary internal rotator?

Explanation:
Internal rotation of the shoulder is produced mainly by the Subscapularis. This muscle sits on the anterior (front) surface of the scapula and attaches to the lesser tubercle of the humerus. When its fibers contract, they pull the humerus inward (medially), making it the primary internal rotator among the rotator cuff muscles. It also helps stabilize the humeral head in the glenoid during movement. The other rotator cuff muscles work in different directions: the Supraspinatus mostly initiates abduction, while the Infraspinatus and Teres Minor are the primary external rotators. So, for internal rotation, Subscapularis is the best match.

Internal rotation of the shoulder is produced mainly by the Subscapularis. This muscle sits on the anterior (front) surface of the scapula and attaches to the lesser tubercle of the humerus. When its fibers contract, they pull the humerus inward (medially), making it the primary internal rotator among the rotator cuff muscles. It also helps stabilize the humeral head in the glenoid during movement.

The other rotator cuff muscles work in different directions: the Supraspinatus mostly initiates abduction, while the Infraspinatus and Teres Minor are the primary external rotators. So, for internal rotation, Subscapularis is the best match.

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