Which bone forms the elbow's bony prominence?

Which bone forms the elbow's bony prominence?

• A. Capitulum
• B. Olecranon
• C. Trochlea
• D. Tibia

Answer: (B)

The elbow’s noticeable bump comes from the olecranon, the posterior projection of the ulna. This bony prominence sits at the tip of the elbow and is the part you can feel on the back of your elbow when you flex or extend your arm. The capitulum and trochlea are features of the distal humerus that form the elbow joint surfaces with the forearm bones, so they aren’t the external bump. The tibia is a leg bone and not involved in the elbow.

The elbow’s noticeable bump comes from the olecranon, the posterior projection of the ulna. This bony prominence sits at the tip of the elbow and is the part you can feel on the back of your elbow when you flex or extend your arm. The capitulum and trochlea are features of the distal humerus that form the elbow joint surfaces with the forearm bones, so they aren’t the external bump. The tibia is a leg bone and not involved in the elbow.