Trapezium (bone)

Trapezium (bone)

Infobox Bone
Name = Trapezium (bone)
Latin = os trapezium, os multangulum majus
GraySubject = 54
GrayPage = 225


Caption = BONES OF HAND
"Proximal:" A=Scaphoid, B=Lunate, C=Triquetral, D=Pisiform
"Distal:" E=Trapezium, F=Trapezoid, G=Capitate, H=Hamate



Caption2 = Trapezium
Origins =
Insertions =
Articulations = 1st metacarpal distally
scaphoid proximally
trapezoid medially
2nd metacarpal medially
MeshName = Trapezium+Bone
MeshNumber = A02.835.232.087.319.150.800
DorlandsPre = o_07
DorlandsSuf = 12598800
The trapezium bone (greater multangular bone) is a carpal bone, in what is commonly referred to as the wrist.

The trapezium is distinguished by a deep groove on its palmar surface. It is situated at the radial side of the carpus, between the scaphoid and the first metacarpal bone.

The etymology derives from the Greek "trapezion" which means "irregular quadrilateral;" literally, "a little table," from "trapeza" meaning table. Also, from "tra-" "four" and "peza" "foot" or "edge."

urfaces

The "superior surface" is directed upward and medialward; medially it is smooth, and articulates with the scaphoid; laterally it is rough and continuous with the lateral surface.

The "inferior surface" is oval, concave from side to side, convex from before backward, so as to form a saddle-shaped surface for articulation with the base of the first metacarpal bone.

The "dorsal surface" is rough.

The "palmar surface" is narrow and rough. At its upper part is a deep groove, running from above obliquely downward and medialward; it transmits the tendon of the Flexor carpi radialis, and is bounded laterally by an oblique ridge. This surface gives origin to the Opponens pollicis and to the Abductor and Flexor pollicis brevis; it also affords attachment to the transverse carpal ligament.

The "lateral surface" is broad and rough, for the attachment of ligaments.

The "medial surface" presents two facets; the upper, large and concave, articulates with the trapezoid; the lower, small and oval, with the base of the second metacarpal.

Tubercle of trapezium

The tubercle of trapezium is a anatomic tubercle, where sometimes abductor pollicis brevis muscle attaches.

See also

*Bone terminology
*Terms for anatomical location
*Finger
*Hand


=Additional


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  • trapezium bone — noun the wrist bone on the thumb side of the hand that articulates with the 1st and 2nd metacarpals • Syn: ↑trapezium, ↑os trapezium • Hypernyms: ↑carpal bone, ↑carpal, ↑wrist bone …   Useful english dictionary

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  • Trapezium — The word trapezium has several meanings:* The quadrilateral also known as the trapezoid (having one pair of parallel sides) * The quadrilateral having no parallel sides (USA only) * Trapezium (bone), a bone in the wrist * Trapezium (astronomy), a …   Wikipedia

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  • trapezium — 1560s, from L.L. trapezium, from Gk. trapezion irregular quadrilateral, lit. a little table, dim. of trapeza table, from tra four (see FOUR (Cf. four)) + peza foot, edge, related to pous (see FOOT (Cf …   Etymology dictionary

  • trapezium — [trə pē′zē əm, trapē′zē əm] n. pl. trapeziums or trapezia [trə pē′zēə, tra pē′zēə] [LL < Gr trapezion, trapezium, lit., small table, dim. of trapeza, table, lit., four footed bench < tra , for tetra, FOUR + peza, foot; akin to pous, FOOT] 1 …   English World dictionary

  • Trapezium — Tra*pe zi*um, n.; pl. E. {Trapeziums}, L. {Trapezia}. [NL., fr. Gr. ? a little table, an irregular four sided figure, dim. of ? a table, for ?; ? (see {Tetra }) + ? foot, akin to ? foot; hence, originally, a table with four feet. See {Foot}.] 1.… …   The Collaborative International Dictionary of English

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