Anatomy The forcible separation of the head of the radius from the capitulum of the humerus is mainly prevented by the? A Aicular capsule B Annular ligament C Quadrate ligament D Radial collateral ligament 💡 Explanation The forcible separation of the head of the radius from the capitulum of the humerus is mainly prevented by the? ✓ Correct Answer: B. Annular ligament