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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) | 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. | |||
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 == | |||
*[[Bone#Terminology|Bone terminology]] | |||
*[[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}} | |||
[[Category:Skeletal system]] | |||
[[Category:wrist]] | |||
{{musculoskeletal-stub}} | |||
[[fr:Os triquetrum]] | |||
[[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.
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)
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. Dorsal surface.
Template:Bones of upper extremity
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.
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