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pisiform bone (''os pisiforme'')
The Triangular Bone (os triquetum; cuneiform bone) (Fig. 223).—The triangular bone may be distinguished by its pyramidal shape, and by an oval isolated facet for articulation with the pisiform bone. It is situated at the upper and ulnar side of the carpus. The superior surface presents a medial, rough, non-articular portion, and a lateral convex articular portion which articulates with the triangular articular disk of the wrist. The inferior surface, directed lateralward, is concave, sinuously curved, and smooth for articulation with the hamate. The dorsal surface is rough for the attachment of ligaments. The volar surface presents, on its medial part, an oval facet, for articulation with the pisiform; its lateral part is rough for ligamentous attachment. The lateral surface, the base of the pyramid, is marked by a flat, quadrilateral facet, for articulation with the lunate. The medial surface, the summit of the pyramid, is pointed and roughened, for the attachment of the ulnar collateral ligament of the wrist.   8
Articulations.—The triangular articulates with three bones: the lunate laterally, the pisiform in front, the hamate distally; and with the triangular articular disk which separates it from the lower end of the ulna.
 
The Triangular Bone (os triquetrum; cuneiform bone)
 
{{Image|triquetral.JPG|left|300px|triquetral}}
 
{{Infobox Bone |
  Name          = Triquetral bone |
  Latin        = os triquetrum, os pyramidale, os triangulare |
  GraySubject  = 54 |
  GrayPage      = 224 |
  Image        = Carpus.png |
  Caption      = '''BONES OF HAND'''<BR>''Proximal:'' A=[[Scaphoid bone|Scaphoid]], B=[[Lunate bone|Lunate]], C=[[Triquetral bone|Triquetral]], D=[[Pisiform bone|Pisiform]]<BR>''Distal:'' E=[[Trapezium bone|Trapezium]], F=[[Trapezoid bone|Trapezoid]], G=[[Capitate bone|Capitate]], H=[[Hamate bone|Hamate]]<BR> |
  Image2        = Gray223.png |
  Caption2      = The left triquetal bone. |
  Origins      = |
  Insertions    = |
  Articulations = articulates with ''three'' bones:<BR>[[lunate]] laterally<BR>[[pisiform]] in front<BR>[[hamate]] distally<BR>triangular [[articular disk]] which separates it from the lower end of the [[ulna]]. |
  MeshName      = Triquetrum+Bone |
  MeshNumber    = A02.835.232.087.319.150.831 |
  DorlandsPre  = o_07 |
  DorlandsSuf  = 12598819  |
}}
The '''triquetral bone''' (also called '''triquetrum bone''', '''cuneiform bone''', '''pyramidal bone''', '''cubital bone''', '''three-cornered bone''', and '''triangular bone''') is located in the [[wrist]] on the medial side of the proximal row of the [[carpus]] between the [[lunate]] and [[pisiform]] bones. It is on the [[ulnar]] side of the hand, but does not articulate with the [[ulna]]. It connects with the [[pisiform]], [[hamate]], and [[lunate]] bones. It is the 3rd most commonly fractured carpal bone.
 
The triangular bone may be distinguished by its pyramidal shape, and by an oval isolated facet for articulation with the pisiform bone. It is situated at the upper and ulnar side of the carpus. To facilitate its palpation in an exam, the hand must be radially deviated so that the triquetrium moves out from under the ulnar styloid process. The triquetrum may be difficult to find, since it also lies under the pisiform.
 
The etymology derives from the Latin ''triquetrus'' which means "three-cornered."
 
==Surfaces==
The ''superior surface'' presents a medial, rough, non-articular portion, and a lateral convex articular portion which articulates with the triangular articular disk of the wrist.
 
The ''inferior surface'', directed lateralward, is concave, sinuously curved, and smooth for articulation with the hamate. The dorsal surface is rough for the attachment of ligaments.
 
The ''volar surface'' presents, on its medial part, an oval facet, for articulation with the pisiform; its lateral part is rough for ligamentous attachment.


'''parent article''' - [[wrist]] or [[carpus]]
The ''lateral surface'', the base of the pyramid, is marked by a flat, quadrilateral facet, for articulation with the lunate.


[[Image:Os_pisiforme.GIF|left|thumb|300px|pisiform]]
The ''medial surface'', the summit of the pyramid, is pointed and roughened, for the attachment of the ulnar collateral ligament of the wrist.


The '''pisiform bone (os pisiforme)''' can be distinguished by its small size, and having a single articular facet. It is pea-shaped and is situated anteriorly to the other  bones of the wrist. Its dorsal surface presents a smooth, oval facet, for articulation with the triquetral bone. This facet approaches the superior, but not the inferior border of the bone. The palmar (volar) surface is rounded and rough, giving attachment to the transverse carpal ligament, and to the flexor carpi ulnaris and abductor digiti quinti. The lateral and medial surfaces are also rough, the former being concave, the latter usually convex.
== See also ==
*[[Bone#Terminology|Bone terminology]]
Articulation: the pisiform bone articulates only with one other bone, the triquetral.
*[[Terms for anatomical location]]
 
==Additional images==
<gallery>
Image:Gray219.png|Bones of the left hand. Volar surface.
Image:Gray220.png|Bones of the left hand. Dorsal surface.
</gallery>
 
{{Bones of upper extremity}}


Volar: Pertaining to both the palm and sole. It comes from word "vola" which the ancient Romans used for "the palm of the hand and the sole of the foot."
[[Category:Skeletal system]]
[[Category:wrist]]


cf palmar (palm side of hand)and plantar (sole of foot)


The Triangular Bone (os triquetrum; cuneiform bone)
{{musculoskeletal-stub}}


lentiform bone
[[fr:Os triquetrum]]
The etymology derives from the Latin pīsum which means "pea."
[[nl:Os triquetrum]]
[[sk:Trojhranná kosť]]




Latest revision as of 02:43, 22 November 2023


The account of this former contributor was not re-activated after the server upgrade of March 2022.


Template:Systemic

The Triangular Bone (os triquetum; cuneiform bone) (Fig. 223).—The triangular bone may be distinguished by its pyramidal shape, and by an oval isolated facet for articulation with the pisiform bone. It is situated at the upper and ulnar side of the carpus. The superior surface presents a medial, rough, non-articular portion, and a lateral convex articular portion which articulates with the triangular articular disk of the wrist. The inferior surface, directed lateralward, is concave, sinuously curved, and smooth for articulation with the hamate. The dorsal surface is rough for the attachment of ligaments. The volar surface presents, on its medial part, an oval facet, for articulation with the pisiform; its lateral part is rough for ligamentous attachment. The lateral surface, the base of the pyramid, is marked by a flat, quadrilateral facet, for articulation with the lunate. The medial surface, the summit of the pyramid, is pointed and roughened, for the attachment of the ulnar collateral ligament of the wrist. 8

Articulations.—The triangular articulates with three bones: the lunate laterally, the pisiform in front, the hamate distally; and with the triangular articular disk which separates it from the lower end of the ulna.

The Triangular Bone (os triquetrum; cuneiform bone)

triquetral

Template:Infobox Bone The triquetral bone (also called triquetrum bone, cuneiform bone, pyramidal bone, cubital bone, three-cornered bone, and triangular bone) is located in the wrist on the medial side of the proximal row of the carpus between the lunate and pisiform bones. It is on the ulnar side of the hand, but does not articulate with the ulna. It connects with the pisiform, hamate, and lunate bones. It is the 3rd most commonly fractured carpal bone.

The triangular bone may be distinguished by its pyramidal shape, and by an oval isolated facet for articulation with the pisiform bone. It is situated at the upper and ulnar side of the carpus. To facilitate its palpation in an exam, the hand must be radially deviated so that the triquetrium moves out from under the ulnar styloid process. The triquetrum may be difficult to find, since it also lies under the pisiform.

The etymology derives from the Latin triquetrus which means "three-cornered."

Surfaces

The superior surface presents a medial, rough, non-articular portion, and a lateral convex articular portion which articulates with the triangular articular disk of the wrist.

The inferior surface, directed lateralward, is concave, sinuously curved, and smooth for articulation with the hamate. The dorsal surface is rough for the attachment of ligaments.

The volar surface presents, on its medial part, an oval facet, for articulation with the pisiform; its lateral part is rough for ligamentous attachment.

The lateral surface, the base of the pyramid, is marked by a flat, quadrilateral facet, for articulation with the lunate.

The medial surface, the summit of the pyramid, is pointed and roughened, for the attachment of the ulnar collateral ligament of the wrist.

See also

Additional images

  • Bones of the left hand. Volar surface.

    Bones of the left hand. Volar surface.

  • Bones of the left hand. Dorsal surface.

    Bones of the left hand. Dorsal surface.

Template:Bones of upper extremity


Template:Musculoskeletal-stub

fr:Os triquetrum nl:Os triquetrum sk:Trojhranná kosť


By comparison, the term "palm" applies to only the palm (the grasping side) of the hand. The Romans actually used the word "palma" for the outstretched palm of the hand.

Topics in Anatomy

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Systemic Overview

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  • Blood, Lymphoid Tissues and Haemopoiesis
  • Functional Anatomy of the Musculoskeletal System
  • Smooth Muscle and the Cardiovascular and Lymphatic systems
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  • Endocrine System
  • Principles of Hormone Production and Secretion
  • Embryology
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