Which joint is formed at the articulation of the radius and ulna at the elbow?

• A. Humeroulnar joint
• B. Proximal radioulnar joint
• C. Distal radioulnar joint
• D. Wrist joint

Answer: (B)

The joint formed at the articulation of the radius and ulna at the elbow is the proximal radioulnar joint. This joint is specifically located at the upper end of the radius and ulna, allowing for pivot motion which is crucial for activities such as pronation and supination of the forearm.

In this joint, the head of the radius rotates within the radial notch of the ulna, enabling the mobility required for tasks like turning a doorknob or rotating the palm upward and downward. This functionality distinguishes the proximal radioulnar joint from other joints in the vicinity, such as the humeroulnar joint, which connects the humerus with the ulna at the elbow, or the distal radioulnar joint, located at the opposite end of the forearm near the wrist. Thus, the classification of this joint specifically as the proximal radioulnar joint emphasizes its unique role in forearm movement.