Ulnar canal

Although he was primarily known for work with genitourinary anatomy, Guyon is credited with the discovery of the ulnar canal at the wrist.

Entrapment of the ulnar nerve at the ulnar canal can result in ulnar neuropathy.

The ulnar nerve and artery pass superficial to the flexor retinaculum, via the ulnar canal.

The ulnar canal or ulnar tunnel, also called Guyon's canal, is a space at the wrist between flexor retinaculum and the palmar carpal ligament (which runs between the pisiform bone and the hamate bone), through which the ulnar artery and the ulnar nerve travel into the hand.