Trapezoid bone

Trapezoid bone

Infobox Bone
Name = Trapezoid bone
Latin = os trapezoideum, os multangulum minus
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 = The left lesser multangular bone.
Origins =
Insertions =
Articulations = articulates with four bones:
scaphoid proximally
second metacarpal distally
trapezium bone laterally
capitate medially
MeshName = Trapezoid+Bone
MeshNumber = A02.835.232.087.319.150.805
DorlandsPre = o_07
DorlandsSuf = 12598807
The trapezoid bone (lesser multangular bone) is a carpal bone in tetrapods, including humans. It is the smallest bone in the distal row. It may be known by its wedge-shaped form, the broad end of the wedge constituting the dorsal, the narrow end the palmar surface; and by its having four articular facets touching each other, and separated by sharp edges.

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

urfaces

The "superior surface", quadrilateral, smooth, and slightly concave, articulates with the scaphoid.

The "inferior surface" articulates with the proximal end of the second metacarpal bone; it is convex from side to side, concave from before backward and subdivided by an elevated ridge into two unequal facets.

The "dorsal" and "palmar surfaces" are rough for the attachment of ligaments, the former being the larger of the two.

The "lateral surface", convex and smooth, articulates with the trapezium.

The "medial surface" is concave and smooth in front, for articulation with the capitate; rough behind, for the attachment of an interosseous ligament.

See also

*Bone terminology
*Terms for anatomical location
*Trapezoid distinguishing meanings of trapezoid and trapezium in American English and British English


=Additional


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Look at other dictionaries:

  • trapezoid bone — n TRAPEZOID * * * a bone of the wrist (see carpus). It articulates with the second metatarsal bone in front, with the scaphoid bone behind, and with the trapezium and capitate bones on either side. * * * os trapezoideum …   Medical dictionary

  • trapezoid bone — noun the wrist bone between the trapezium and the capitate bones • Syn: ↑trapezoid, ↑os trapezoideum • Hypernyms: ↑carpal bone, ↑carpal, ↑wrist bone …   Useful english dictionary

  • trapezoid bone — a bone of the wrist (see carpus). It articulates with the second metatarsal bone in front, with the scaphoid bone behind, and with the trapezium and capitate bones on either side …   The new mediacal dictionary

  • trapezoid bone — noun One of the carpal bones of the wrist. Syn: trapezoid, os trapezoideum …   Wiktionary

  • trapezoid bone of Lyser — os trapezium …   Medical dictionary

  • Trapezoid (disambiguation) — Trapezoid may refer to:*trapezoid or trapezium, a geometric figure *trapezoid bone, a bone in the hand *Trapezoid (band), an American folk music group *Goaltender trapezoid, an area of a hockey rink. *The former musical project of Neil Cicierega …   Wikipedia

  • trapezoid — 1. Resembling a trapezium. SYN: trapeziform. 2. A geometrical figure resembling a trapezium except that two of its opposite sides are parallel. 3. SYN: t. (bone). 4. SYN: t. body. [G. trapeza, table, + eidos, resemblance] * * * trap·e·zoid trap ə …   Medical dictionary

  • trapezoid — noun /ˈtræpəzɔɪd/ a) A (convex) quadrilateral with two (non adjacent) parallel sides. b) The trapezoid bone of the wrist. Syn: trapezium, irregular, quadrilateral …   Wiktionary

  • Bone — is the substance that forms the skeleton of the body. It is composed chiefly of calcium phosphate and calcium carbonate. It also serves as a storage area for calcium, playing a large role in calcium balance in the blood. The 206 bones in the body …   Medical dictionary

  • Trapezoid line — Bone: Trapezoid line Left clavicle. Inferior surface. (Oblique line for trapezoid lig. labeled at center right.) Latin linea trapezoidea Gray s …   Wikipedia

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