Anatomy, Shoulder and Upper Limb, Hand Guyon Canal

Excerpt

Guyon canal is a space at the ulnar (medial) border of the volar aspect of the wrist. It can also be referred to as the ulnar canal or ulnar tunnel. This canal is an anatomical fibro-osseous structure. The canal begins at the proximal border of the pisiform bone and ends distally at the hook of the hamate. This anatomical space houses the ulnar nerve and ulnar artery as they pass from the distal forearm into the hand. Compression of the ulnar nerve in the Guyon canal is the fourth most common tunnel syndrome, and a more common site of compression of the ulnar nerve is the cubital tunnel.