Internal rotation is described as which group in the shoulder?

Internal rotation is described as which group in the shoulder?

• A. Internal Rotators
• B. Biceps Brachi
• C. Wrist Extensors
• D. External Rotators

Answer: (D)

Internal rotation of the shoulder is carried out by the internal rotator muscles. The primary driver is the subscapularis, located on the front of the shoulder blade, with additional contribution from latissimus dorsi, teres major, pectoralis major, and the anterior fibers of the deltoid. External rotators—like the infraspinatus, teres minor, and the posterior deltoid—do the opposite, rotating the arm outward. The biceps brachii mainly flexes the elbow and supinates the forearm, and wrist extensors act at the wrist, so they’re not the muscles that describe internal rotation.

Internal rotation of the shoulder is carried out by the internal rotator muscles. The primary driver is the subscapularis, located on the front of the shoulder blade, with additional contribution from latissimus dorsi, teres major, pectoralis major, and the anterior fibers of the deltoid. External rotators—like the infraspinatus, teres minor, and the posterior deltoid—do the opposite, rotating the arm outward. The biceps brachii mainly flexes the elbow and supinates the forearm, and wrist extensors act at the wrist, so they’re not the muscles that describe internal rotation.