The posterior elbow prominence is the olecranon process; which option lists it?

• A. Capitulum
• B. Olecranon process
• C. Radial head
• D. Ulnar head

Answer: (B)

The posterior elbow prominence is the olecranon process, the large projection at the proximal end of the ulna that forms the tip of the elbow and serves as the triceps tendon insertion. The capitulum is a distal humeral surface that articulates with the radial head, the radial head is the proximal end of the radius, and the ulnar head is the distal end of the ulna. Since the palpable bump at the back of the elbow comes from the ulna’s proximal posterior projection, the olecranon process is the correct label.