Which location houses the ulnar nerve behind the medial epicondyle?

• A. Carpal tunnel
• B. Cubital tunnel
• C. Guyon's canal
• D. Radial groove

Answer: (B)

The ulnar nerve travels behind the medial epicondyle of the humerus in a narrow passage called the cubital tunnel. This tunnel, formed as the nerve runs in a groove between the medial epicondyle and the olecranon (with the roof provided by Osborne’s ligament), is the elbow region where the nerve is most exposed to compression, especially when the elbow is bent.

In contrast, the carpal tunnel at the wrist houses the median nerve, Guyon’s canal at the wrist houses the ulnar nerve as it enters the hand, and the radial groove on the humerus is where the radial nerve runs.