Ulnar canal

The ulnar canal, also called Guyon's canal, is a potential space at the wrist between the pisiform bone and the hamate bone through which the ulnar artery and the ulnar nerve travel into the hand. Guyon's canal was named after French surgeon Jean Casimir Félix Guyon (1831-1920).

Clinical significance
Entrapment of the ulnar nerve at the ulnar canal can result in ulnar neuropathy at the wrist. There are four subtypes of ulnar neuropathy at the wrist, of which type II is the most common. Guyon's canal syndrome may be secondary to ganglion cyst or compression against cycling handlebar.