Triquetral bone: Difference between revisions

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[[file:Triangular_bone_(left_hand)_-_animation01.gif|thumb|Triangular bone (left hand) - animation01]] [[file:Triangular_bone_(left_hand)_-_animation02.gif|thumb|Triangular bone (left hand) - animation02|left]] [[file:Triquetral_bone.jpg|thumb|Triquetral bone]] [[file:RightHumanPosteriorDistalRadiusUlnaCarpals_-_Triquetral_bone.png|thumb|RightHumanPosteriorDistalRadiusUlnaCarpals - Triquetral bone|left]] [[file:RightHumanAnteriorDistalRadiusUlnaCarpals_-_Triquetral_bone.png|thumb|RightHumanAnteriorDistalRadiusUlnaCarpals - Triquetral bone]] [[file:Gray219_-_Triangular_bone.png|thumb|Gray's anatomy image 219 - Triangular bone]] {{Short description|Bone of the human wrist}}
[[File:Gray223.png|thumb]] [[File:Triangular bone (left hand) - animation01.gif|thumb]] [[File:Triangular bone (left hand) - animation02.gif|thumb]] [[File:Triquetral bone.jpg|thumb]] {{Short description|Detailed article on the triquetral bone}}
{{Infobox bone
{{Infobox bone
| Name           = Triquetral bone
| Name = Triquetral bone
| Latin           = Os triquetrum
| Latin = Os triquetrum
| Image          = Triquetrum bone (left hand) 01 palmar view.png
| Caption = Location of the triquetral bone (highlighted in red)
| Caption        = Left hand anterior view (palmar view). Triquetral bone shown in red.
| Partof = [[Carpal bones]]
| Image2          = Triquetrum bone (left hand) 02 dorsal view.png
| System = [[Skeletal system]]
| Caption2        = Left hand posterior view (dorsal view). Triquetral bone shown in red.
| Articulations = [[Lunate bone]], [[Pisiform bone]], [[Hamate bone]]
| Articulations   = [[Lunate bone]], [[Pisiform bone]], [[Hamate bone]]
}}
}}


The '''triquetral bone''', also known as the '''triquetrum''', '''triangular bone''', or '''cuneiform bone''', is one of the eight [[carpal bones]] of the [[wrist]]. It is situated on the medial side of the proximal row of the carpus, between the [[lunate bone]] and the [[pisiform bone]].
The '''triquetral bone''', also known as the '''os triquetrum''', is one of the eight [[carpal bones]] of the wrist. It is situated on the ulnar side of the wrist, proximal to the [[pisiform bone]] and distal to the [[ulna]]. The triquetral bone is part of the proximal row of carpal bones, which also includes the [[scaphoid bone]], [[lunate bone]], and [[pisiform bone]].


== Anatomy ==
==Anatomy==
The triquetral bone is a three-sided bone that articulates with three other carpal bones: the [[lunate bone]], the [[pisiform bone]], and the [[hamate bone]]. It is located in the proximal row of the carpus, which is the row closest to the forearm. The bone has a pyramidal shape and is characterized by its three distinct surfaces.
The triquetral bone is a pyramidal-shaped bone that is located in the proximal row of the carpus. It is the third most commonly fractured carpal bone, following the scaphoid and lunate bones.


=== Surfaces ===
===Surfaces===
* The superior surface articulates with the [[ulna]] via the [[triangular fibrocartilage complex]] (TFCC).
The triquetral bone has several distinct surfaces:
* The inferior surface articulates with the [[hamate bone]].
* The lateral surface articulates with the [[lunate bone]].
* The anterior surface articulates with the [[pisiform bone]].


== Function ==
* '''Dorsal surface''': This surface is rough and serves as an attachment point for ligaments.
The triquetral bone plays a crucial role in the complex movements of the wrist. It contributes to the stability and flexibility of the wrist joint, allowing for a wide range of motion. The bone also serves as an attachment point for various ligaments that support the wrist.
* '''Palmar surface''': This surface is also rough and provides attachment for the [[pisohamate ligament]].
* '''Lateral surface''': This surface articulates with the [[lunate bone]].
* '''Medial surface''': This surface articulates with the [[pisiform bone]].
* '''Distal surface''': This surface articulates with the [[hamate bone]].


== Clinical Significance ==
===Articulations===
Injuries to the triquetral bone are relatively uncommon but can occur due to trauma, such as a fall on an outstretched hand. Fractures of the triquetral bone can lead to pain, swelling, and limited motion in the wrist. Diagnosis is typically confirmed through imaging studies such as X-rays or MRI.
The triquetral bone articulates with three other carpal bones:


== Related Pages ==
* The [[lunate bone]] laterally.
* The [[pisiform bone]] anteriorly.
* The [[hamate bone]] distally.
 
==Function==
The triquetral bone plays a crucial role in the complex movements of the wrist. It contributes to the stability and flexibility of the wrist joint, allowing for a wide range of motion. The bone also serves as an attachment point for ligaments that stabilize the carpal bones.
 
==Clinical significance==
 
===Fractures===
Triquetral fractures are relatively uncommon but can occur due to direct trauma or falls on an outstretched hand. These fractures are often associated with injuries to other carpal bones or ligaments.
 
===Triquetral impingement===
Triquetral impingement can occur when the bone is compressed between the ulna and the carpal bones, leading to pain and limited motion.
 
==Development==
The triquetral bone ossifies from a single center, which appears between the ages of 9 and 12 years. It is one of the last carpal bones to ossify.
 
==Etymology==
The name "triquetral" is derived from the Latin word "triquetrus," meaning "three-cornered," which reflects the bone's pyramidal shape.
 
==Also see==
* [[Carpal bones]]
* [[Carpal bones]]
* [[Lunate bone]]
* [[Lunate bone]]
* [[Pisiform bone]]
* [[Pisiform bone]]
* [[Hamate bone]]
* [[Hamate bone]]
* [[Scaphoid bone]]
* [[Wrist joint]]
* [[Wrist joint]]
* [[Triangular fibrocartilage complex]]


{{Carpal bones}}
[[Category:Carpal bones]]
[[Category:Skeletal system]]
[[Category:Skeletal system]]
[[Category:Upper limb anatomy]]
[[Category:Carpal bones]]
[[Category:Human anatomy]]
{{Skeletal system}}
{{medicine-stub}}

Latest revision as of 15:44, 9 December 2024

File:Gray223.png
File:Triangular bone (left hand) - animation01.gif
File:Triangular bone (left hand) - animation02.gif
File:Triquetral bone.jpg

Detailed article on the triquetral bone


General Information
Latin Os triquetrum
Greek
TA98
TA2
FMA
Details
System Skeletal system
Artery
Vein
Nerve
Lymphatic drainage
Precursor
Function
Identifiers
Clinical significance
Notes

The triquetral bone, also known as the os triquetrum, is one of the eight carpal bones of the wrist. It is situated on the ulnar side of the wrist, proximal to the pisiform bone and distal to the ulna. The triquetral bone is part of the proximal row of carpal bones, which also includes the scaphoid bone, lunate bone, and pisiform bone.

Anatomy[edit]

The triquetral bone is a pyramidal-shaped bone that is located in the proximal row of the carpus. It is the third most commonly fractured carpal bone, following the scaphoid and lunate bones.

Surfaces[edit]

The triquetral bone has several distinct surfaces:

  • Dorsal surface: This surface is rough and serves as an attachment point for ligaments.
  • Palmar surface: This surface is also rough and provides attachment for the pisohamate ligament.
  • Lateral surface: This surface articulates with the lunate bone.
  • Medial surface: This surface articulates with the pisiform bone.
  • Distal surface: This surface articulates with the hamate bone.

Articulations[edit]

The triquetral bone articulates with three other carpal bones:

Function[edit]

The triquetral bone plays a crucial role in the complex movements of the wrist. It contributes to the stability and flexibility of the wrist joint, allowing for a wide range of motion. The bone also serves as an attachment point for ligaments that stabilize the carpal bones.

Clinical significance[edit]

Fractures[edit]

Triquetral fractures are relatively uncommon but can occur due to direct trauma or falls on an outstretched hand. These fractures are often associated with injuries to other carpal bones or ligaments.

Triquetral impingement[edit]

Triquetral impingement can occur when the bone is compressed between the ulna and the carpal bones, leading to pain and limited motion.

Development[edit]

The triquetral bone ossifies from a single center, which appears between the ages of 9 and 12 years. It is one of the last carpal bones to ossify.

Etymology[edit]

The name "triquetral" is derived from the Latin word "triquetrus," meaning "three-cornered," which reflects the bone's pyramidal shape.

Also see[edit]

Template:Carpal bones

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