Anatomy Which of the following is true of the rotator cuff? A Teres major is one of its four constituent muscles. B The infraspinatus is innervated by the suprascapular nerve. C Pa of its action is to pull the humeral head superiorly. D Subscapularis inses onto the greater tuberosity of the humerus. 💡 Explanation Which of the following is true of the rotator cuff? ✓ Correct Answer: B. The infraspinatus is innervated by the suprascapular nerve.