Which structure articulates with the radial head in the elbow?

• A. Capitulum
• B. Trochlea
• C. Coronoid process
• D. Olecranon

Answer: (A)

The capitulum is the structure that articulates with the radial head in the elbow. It is a small, rounded structure located at the distal end of the humerus and is specifically designed to articulate with the head of the radius during elbow flexion and extension. This articulation allows for the rotation of the radius around the stationary ulna, which is essential for actions such as pronation and supination of the forearm.

Understanding the anatomy of the elbow joint is crucial, as it comprises several important structures. The trochlea, while also a part of the humerus, articulates with the ulna, not the radius. The coronoid process and olecranon are parts of the ulna; they serve different roles within the elbow joint but do not directly articulate with the radial head. The unique relationship between the capitulum and the radial head is essential for enabling proper motion and stability in the elbow joint.