Trapezoid bone: Difference between revisions
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== Trapezoid Bone == | |||
[[File:Trapezoid_bone_(left_hand)_01_palmar_view.png|Palmar view of the trapezoid bone in the left hand|thumb|right]] | |||
The '''trapezoid bone''', also known as the '''os trapezoideum''', is one of the eight [[carpal bones]] in the human [[wrist]]. It is situated in the distal row of the carpal bones and is the smallest bone in this row. The trapezoid bone plays a crucial role in the complex movements of the wrist and hand, contributing to the dexterity and functionality of the human hand. | |||
The trapezoid bone is | |||
== Anatomy == | |||
[[File:Gray226.png|Illustration showing the position of the trapezoid bone|thumb|left]] | |||
The trapezoid bone is located between the [[trapezium bone]] laterally and the [[capitate bone]] medially. It articulates with four bones: the second [[metacarpal bone]], the trapezium, the capitate, and the [[scaphoid bone]]. The trapezoid bone is characterized by its wedge shape, with the broader end facing dorsally and the narrower end facing palmarly. | |||
== | === Surfaces === | ||
The trapezoid bone has six surfaces: | |||
File:Trapezoid_bone_(left_hand)_-_animation01.gif|Animation of the trapezoid bone in the left hand | * '''Dorsal surface''': This surface is rough and provides attachment for ligaments. | ||
File:Trapezoid_bone_(left_hand)_-_animation02.gif|Another animation of the trapezoid bone in the left hand | * '''Palmar surface''': Also rough, it serves as an attachment point for ligaments. | ||
File:Trapezoid_bone.jpg|Image of the trapezoid bone | * '''Lateral surface''': Articulates with the trapezium. | ||
File:RightHumanPosteriorDistalRadiusUlnaCarpals_-_Trapezoid_bone.png|Posterior view of the trapezoid bone | * '''Medial surface''': Articulates with the capitate. | ||
File:Gray220_-_Trapezoid_bone.png|Diagram showing the trapezoid bone | * '''Proximal surface''': Articulates with the scaphoid. | ||
File:Gray219_-_Trapezoid_bone.png|Lateral view of the trapezoid bone | * '''Distal surface''': Articulates with the second metacarpal. | ||
== Function == | |||
The trapezoid bone is integral to the stability and movement of the wrist. It helps in the transmission of forces from the hand to the forearm and allows for the intricate movements necessary for gripping and manipulating objects. The articulation with the second metacarpal is particularly important for the precision grip. | |||
== Development == | |||
The trapezoid bone ossifies from a single center, which appears between the ages of 4 and 6 years. This ossification process is part of the normal development of the carpal bones, which typically complete ossification by late adolescence. | |||
== Clinical Significance == | |||
Injuries to the trapezoid bone are rare due to its protected position within the carpal bones. However, fractures can occur, often as a result of direct trauma or severe wrist injuries. Such fractures may require immobilization or surgical intervention depending on the severity. | |||
== Images == | |||
[[File:Trapezoid_bone_(left_hand)_-_animation01.gif|Animation of the trapezoid bone in the left hand|thumb|right]] | |||
[[File:Trapezoid_bone_(left_hand)_-_animation02.gif|Another animation of the trapezoid bone in the left hand|thumb|left]] | |||
[[File:Trapezoid_bone.jpg|Image of the trapezoid bone|thumb|right]] | |||
[[File:RightHumanPosteriorDistalRadiusUlnaCarpals_-_Trapezoid_bone.png|Posterior view of the trapezoid bone|thumb|left]] | |||
[[File:Gray220_-_Trapezoid_bone.png|Diagram showing the trapezoid bone|thumb|right]] | |||
[[File:Gray219_-_Trapezoid_bone.png|Lateral view of the trapezoid bone|thumb|left]] | |||
== Related Pages == | |||
* [[Carpal bones]] | * [[Carpal bones]] | ||
* [[Trapezium bone]] | * [[Trapezium bone]] | ||
* [[Capitate bone]] | * [[Capitate bone]] | ||
* [[Scaphoid bone]] | |||
* [[Metacarpal bones]] | |||
[[Category:Carpal bones]] | [[Category:Carpal bones]] | ||
Latest revision as of 11:04, 23 March 2025
Trapezoid Bone[edit]
_01_palmar_view.png)
The trapezoid bone, also known as the os trapezoideum, is one of the eight carpal bones in the human wrist. It is situated in the distal row of the carpal bones and is the smallest bone in this row. The trapezoid bone plays a crucial role in the complex movements of the wrist and hand, contributing to the dexterity and functionality of the human hand.
Anatomy[edit]
The trapezoid bone is located between the trapezium bone laterally and the capitate bone medially. It articulates with four bones: the second metacarpal bone, the trapezium, the capitate, and the scaphoid bone. The trapezoid bone is characterized by its wedge shape, with the broader end facing dorsally and the narrower end facing palmarly.
Surfaces[edit]
The trapezoid bone has six surfaces:
- Dorsal surface: This surface is rough and provides attachment for ligaments.
- Palmar surface: Also rough, it serves as an attachment point for ligaments.
- Lateral surface: Articulates with the trapezium.
- Medial surface: Articulates with the capitate.
- Proximal surface: Articulates with the scaphoid.
- Distal surface: Articulates with the second metacarpal.
Function[edit]
The trapezoid bone is integral to the stability and movement of the wrist. It helps in the transmission of forces from the hand to the forearm and allows for the intricate movements necessary for gripping and manipulating objects. The articulation with the second metacarpal is particularly important for the precision grip.
Development[edit]
The trapezoid bone ossifies from a single center, which appears between the ages of 4 and 6 years. This ossification process is part of the normal development of the carpal bones, which typically complete ossification by late adolescence.
Clinical Significance[edit]
Injuries to the trapezoid bone are rare due to its protected position within the carpal bones. However, fractures can occur, often as a result of direct trauma or severe wrist injuries. Such fractures may require immobilization or surgical intervention depending on the severity.
Images[edit]
_-_animation01.gif)
_-_animation02.gif)
