Final answer:
The radial collateral, annular, and ulnar collateral ligaments provide stability for the elbow joint, preventing unwanted movements and hyperextension, while allowing for proper rotation of the radius.
Step-by-step explanation:
The radial collateral, annular, and ulnar collateral ligaments are key structures that provide stability for the elbow joint. Specifically, the radial collateral ligament extends from the lateral epicondyle of the humerus and merges with the annular ligament, which in turn encircles the head of the radius at the elbow's lateral side.
Together with the ulnar collateral ligament, which runs from the medial epicondyle of the humerus to the medial ulna, these ligaments prevent side-to-side movements and hyperextension, ensuring the stability of the elbow joint. Moreover, at the proximal radioulnar joint—a pivot joint allowing for the rotation of the radius during pronation and supination movements of the forearm—the annular ligament holds the head of the radius in place. Such structural support is essential for the proper function and mechanical integrity of the elbow's complex range of motion.