Which muscle medially rotates the shoulder?

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Prepare for the NHI Eastern Kinesiology Test with our comprehensive quiz. Utilize flashcards and multiple-choice questions, complete with hints and detailed explanations. Ready yourself for success!

Multiple Choice

Which muscle medially rotates the shoulder?

Explanation:
Internal rotation of the shoulder is produced primarily by the subscapularis, a rotator cuff muscle located on the anterior surface of the scapula. When it contracts, it pulls the humeral head toward the body and twists the arm inward, creating medial (internal) rotation. The infraspinatus is an important external rotator, while the levator scapulae and trapezius mainly move or stabilize the scapula and neck rather than medially rotating the humerus. So the muscle that best explains medially rotating the shoulder is the subscapularis.

Internal rotation of the shoulder is produced primarily by the subscapularis, a rotator cuff muscle located on the anterior surface of the scapula. When it contracts, it pulls the humeral head toward the body and twists the arm inward, creating medial (internal) rotation. The infraspinatus is an important external rotator, while the levator scapulae and trapezius mainly move or stabilize the scapula and neck rather than medially rotating the humerus. So the muscle that best explains medially rotating the shoulder is the subscapularis.

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