Guyon's canal is an anatomical compartment through which the ulnar nerve and ulnar artery pass at the level of the wrist. Due to the close anatomical relationships, mechanical overuse of the wrist can lead to compression of the ulnar nerve. Initial symptoms of the so-called Guyon canal syndrome are paresthesias in the little finger. With prolonged nerve injury, motor deficits may also occur, particularly involving the interossei muscles.
Anatomy
Guyon's canal is bounded by the following anatomical structures:
- Dorsal: flexor retinaculum and pisohamate ligament
- Palmar: palmar carpal ligament and palmaris brevis muscle
- Ulnar: pisiform bone
- Radial: hook of the hamate