The '''ulnar canal''', also known as '''Guyon's canal''', is a semi-rigid longitudinal space in the wrist that allows passage of the [[ulnar nerve]] and [[ulnar artery]] into the hand. It is named after the French surgeon [[Jean Casimir Felix Guyon]].
[[File:Gray815.png|thumb|right|Anatomical illustration of the ulnar nerve and artery in the wrist.]]
The '''ulnar canal''', also known as '''Guyon's canal''', is a semi-rigid longitudinal space in the wrist that allows passage of the [[ulnar nerve]] and [[ulnar artery]] into the hand. It is named after the French surgeon [[Jean Casimir Guyon]].
== Anatomy ==
== Anatomy ==
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* [[Ulnar nerve]]
* [[Ulnar nerve]]
* [[Wrist anatomy]]
* [[Wrist anatomy]]
== References ==
[[File:Gray815.png|thumb|right|Anatomical illustration of the ulnar nerve and artery in the wrist.]]
{{Anatomy-stub}}
{{Anatomy-stub}}
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[[Category:Anatomy of the upper limb]]
[[Category:Anatomy of the upper limb]]
[[Category:Wrist]]
[[Category:Wrist]]
<gallery>
File:Carpal-Tunnel.svg|Diagram of the carpal tunnel
File:Gray815.png|Anatomical illustration of the ulnar canal
</gallery>
== Ulnar Canal ==
The '''ulnar canal''', also known as '''Guyon's canal''', is a semi-rigid longitudinal space in the wrist that allows passage of the [[ulnar nerve]] and [[ulnar artery]] into the hand. It is named after the French surgeon Jean Casimir Félix Guyon.
== Anatomy ==
The ulnar canal is located on the medial side of the wrist, superficial to the [[flexor retinaculum of the hand|flexor retinaculum]]. It is bounded by the [[pisiform]] bone medially and the [[hook of hamate]] laterally. The roof of the canal is formed by the [[palmar carpal ligament]] and the [[palmaris brevis]] muscle, while the floor is formed by the flexor retinaculum and the [[hypothenar muscles]].
=== Contents ===
The ulnar canal contains the ulnar nerve and the ulnar artery. The ulnar nerve divides into a superficial branch and a deep branch within the canal. The superficial branch provides sensory innervation to the palmar aspect of the medial one and a half fingers, while the deep branch supplies motor innervation to most of the intrinsic muscles of the hand.
The ulnar artery, which runs alongside the ulnar nerve, supplies blood to the medial aspect of the hand and contributes to the formation of the [[superficial palmar arch]].
== Clinical Significance ==
Compression of the ulnar nerve within the ulnar canal can lead to a condition known as [[ulnar tunnel syndrome]]. This condition is characterized by numbness, tingling, and weakness in the areas of the hand supplied by the ulnar nerve. It is often caused by repetitive trauma, ganglion cysts, or anatomical variations that reduce the space within the canal.
Diagnosis of ulnar tunnel syndrome is typically made through clinical examination and may be confirmed with [[nerve conduction studies]]. Treatment options include rest, splinting, and in severe cases, surgical decompression of the canal.
== Related Pages ==
* [[Ulnar nerve]]
* [[Ulnar artery]]
* [[Flexor retinaculum of the hand]]
* [[Pisiform]]
* [[Hook of hamate]]
* [[Ulnar tunnel syndrome]]
{{Anatomy-stub}}
[[Category:Anatomy of the upper limb]]
== Ulnar Canal ==
The '''ulnar canal''', also known as '''Guyon's canal''', is a semi-rigid longitudinal space in the [[wrist]] that allows passage of the [[ulnar nerve]] and [[ulnar artery]] into the hand. It is named after the French surgeon [[Jean Casimir Félix Guyon]].
=== Anatomy ===
The ulnar canal is located on the [[ulnar side]] of the wrist, which is the side closest to the [[little finger]]. It is bordered by the [[pisiform]] bone and the [[hook of hamate]]. The roof of the canal is formed by the [[palmar carpal ligament]], while the floor is formed by the [[transverse carpal ligament]].
=== Contents ===
The ulnar canal contains the [[ulnar nerve]] and the [[ulnar artery]]. The ulnar nerve is responsible for the innervation of the [[intrinsic muscles of the hand]] and provides sensation to the [[medial aspect]] of the hand, including the little finger and half of the [[ring finger]]. The ulnar artery supplies blood to the [[medial side]] of the hand.
=== Clinical Significance ===
Compression of the ulnar nerve within the ulnar canal can lead to a condition known as [[ulnar tunnel syndrome]]. This condition is characterized by [[numbness]], [[tingling]], and [[weakness]] in the hand, particularly affecting the little finger and half of the ring finger. It can result from [[repetitive stress]], [[trauma]], or [[anatomical variations]] that reduce the space within the canal.
Diagnosis of ulnar tunnel syndrome is typically made through a combination of [[clinical examination]] and [[electrophysiological studies]]. Treatment may involve [[conservative management]] with [[splinting]] and [[anti-inflammatory medications]], or in severe cases, [[surgical decompression]] of the ulnar canal.
=== Related Structures ===
The ulnar canal is closely related to the [[carpal tunnel]], which is located more centrally in the wrist and contains the [[median nerve]] and the [[flexor tendons]].
== See Also ==
* [[Carpal tunnel syndrome]]
* [[Cubital tunnel syndrome]]
* [[Hand anatomy]]
== References ==
* {{Cite book |last=Moore |first=Keith L. |title=Clinically Oriented Anatomy |year=2018 |publisher=Wolters Kluwer |isbn=978-1496347213}}
* {{Cite journal |last=Guyon |first=J.C.F. |title=Note on a new canal in the wrist |journal=Bulletin de la Société Anatomique de Paris |year=1861}}
[[Category:Anatomy]]
[[Category:Upper limb anatomy]]
[[Category:Peripheral nervous system]]
{{Anatomy-stub}}
Latest revision as of 04:28, 29 March 2025
The ulnar canal, also known as Guyon's canal, is a semi-rigid longitudinal space in the wrist that allows passage of the ulnar nerve and ulnar artery into the hand. It is named after the French surgeon Jean Casimir Felix Guyon.
File:Gray815.pngAnatomical illustration of the ulnar nerve and artery in the wrist.
The ulnar canal contains the ulnar nerve and the ulnar artery. The ulnar nerve divides into a superficial branch, which supplies the palmaris brevis and the skin of the medial one and a half fingers, and a deep branch, which innervates the hypothenar muscles, the interossei, the third and fourth lumbricals, and the adductor pollicis.
Compression of the ulnar nerve in the ulnar canal can lead to a condition known as ulnar tunnel syndrome. Symptoms of this condition include numbness and tingling in the ring and little fingers, weakness of the intrinsic muscles of the hand, and a loss of grip strength. Causes of compression can include ganglion cysts, lipomas, or repetitive trauma.
Diagnosis of ulnar tunnel syndrome is typically made through clinical examination and may be confirmed with nerve conduction studies. Treatment options include rest, splinting, and in some cases, surgical decompression of the ulnar canal.
