Floor Of The Distal Ulnar Tunnel

Arises from lateral epicondyle of distal humerus passes through a fibro osseous tunnel as it leaves the f a 6th extensor compartment lies in a bony groove on dorsal surface of ulna inserts into base of 5th mc innervation. The ulnar tunnel is 4 4 5 cm in length and unlike the carpal tunnel the anatomic borders change from proximal to distal. The distal ulnar tunnel was described by anatomist and urological surgeon felix guyon in 1861 based on his anatomical dissections investigating the unique and small protrusion of fatty tissue into the distal forearm noted when pressure was applied to the hypothenar eminence ollier phenomenon.

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4 the pisohamate ligament remains at the floor.

Floor of the distal ulnar tunnel.

1 the triangular shaped loge contained the ulnar nerve and artery with accompanying. The floor of this small tunnel is formed by the transverse carpal ligament its ulnar wall by the pisiform and its roof by the palmar carpal ligament which is an extension of the flexor retinaculum. The tunnel is demarcated by the pisiform proximally and the hook of hamate distally. Between pisiform hamate bones in hand branches.

The roof is formed by a fibrous arch of the hypothenar muscles abductor digiti minimi flexor digiti minimi brevis opponens digiti minimi and palmaris brevis listed from. Under flexor carpi ulnaris guyon s canal. The tunnel begins at the proximal edge of the palmar carpal ligament and ends at the fibrous arch of the hypothenar muscles. In approximately 80 of the population a distal hiatus within the ulnar tunnel exists near the level of the hamate hook.

The distal ulnar tunnel was described by anatomist and urological surgeon felix guyon in 1861 based on his anatomical dissections investigating the unique and small protrusion of fatty tissue into. Lower trunk medial cord ulnar groove. 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 2 3 4. C8 and t1 c7 roots axons pass through brachial plexus.

Nerve entry into wrist. Most distal to elbow. This anatomical space houses the ulnar nerve and ulnar artery as they pass from the distal forearm into the hand. Ulnar nerve the ecu at the distal ulna druj.

Discussion the distal ulnar tunnel is a region of the wrist ap pro imately 4 cm in length in which the ulnar nerve is particularly vulnerable to external compression. The distal ulnar tunnel was described by anatomist and urological surgeon felix guyon in 1861 based on his anatomical dissections investigating the unique and small protrusion of fatty tissue into. The ulnar tunnel is the space through which the ulnar neurovascular bundle passes at the wrist and within this confined space the nerve is susceptible to compression. At elbow cubital tunnel humeral ulnar aponeurosis.

The ulnar nerve and artery run through guyon s canal.