Ulnar Canal

Question 1

What is the ulnar (Guyons) canal?

Answer 1

Fibro-osseous tunnel located at level of the palm
Transmits ulnar neurovascular bundle from forearm into the hand

Question 2

Borders of ulnar canal

Answer 2

4cm in length
Extends from proximal aspect of pisiform bone to origin of hypothenar muscles at the hook of hamate
Medial (ulnar), lateral (radial), roof and floor

Question 3

Medial (ulnar)

Answer 3

Pisiform, flexor carpi ulnaris tendon, abductor digiti minimi muscle

Question 4

Lateral (radial)

Answer 4

Hook of hamate

Question 5

Roof

Answer 5

Palmar carpal ligament

Question 6

Floor

Answer 6

Flexor retinaculum, pisohamate ligament, hypothenar muscles

Question 7

Ulnar canal conveys the

Answer 7

Ulnar neurovascular bundle into the hand

Question 8

Ulnar nerve

Answer 8

Bifurcates within canal into superficial (sensory) and deep (motor) branches

Question 9

Ulnar artery

Answer 9

Located on radial aspect of ulnar nerve. Gives rise to deep palmar branch and continues laterally across the palm as the superficial palmar arch

Question 10

Contents of ulnar canal

Answer 10

Ulnar nerve, ulnar artery, venae comitantes of ulnar artery, lymphatic vessels