Ulnar canal

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Ulnar canal
Transverse section across the wrist and digits.
Superficial palmar nerves.
Latin canalis ulnaris

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.


Guyon's canal was named after French surgeon Jean Casimir Félix Guyon (1831–1920). It is debatable whether he actually described the canal himself.

Clinical significance[edit]

Entrapment of the ulnar nerve at the ulnar canal can result in ulnar neuropathy.[1] 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 formation, or compression against a bicycle handlebar.

See also[edit]


  1. ^ Shea, JD; McClain, EJ (1969). "Ulnar-nerve compression syndromes at and below the wrist". The Journal of bone and joint surgery. American volume 51 (6): 1095–103. PMID 5805411.