Carpus

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Bone: Carpus
Carpus.png
BONES OF HAND
Proximal: A=Scaphoid, B=Lunate, C=Triquetral, D=Pisiform
Distal: E=Trapezium, F=Trapezoid, G=Capitate, H=Hamate
Latin ossa carpi
Gray's subject #54 221
MeSH Carpal+Bones
Dorlands
/ Elsevier
    
o_07/12598168

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]


In tetrapods, the carpus is the cluster of bones in the wrist between the radius and ulna and the metacarpus. The bones of the carpus do not belong to individual fingers (or toes in quadrupeds), whereas those of the metacarpus do. (The corresponding part of the foot is the tarsus.) Carpal bones are not considered part of the hand but are part of the wrist. The carpal bones allow the wrist to move and rotate vertically and horizontally.

Variations

In some macropods, the scaphoid and lunar bones are fused into the scapholunar bone.[1]

The carpus

Row Name Proximal/radial articulations Distal articulations Metacarpal articulations
Proximal Scaphoid radius, lunate trapezium, trapezoid, capitate -
Proximal Lunate radius, scaphoid, triquetral capitate, hamate -
Proximal Triquetral lunate, pisiform (but NOT ulna) hamate -
Proximal Pisiform (sesamoid bone) triquetral - -
Distal Trapezium scaphoid trapezoid #1 and #2
Distal Trapezoid scaphoid trapezium, capitate #2
Distal Capitate scaphoid, lunate trapezoid, hamate #2, #3 and #4
Distal Hamate triquetral, lunate capitate #4 and #5

Mnemonics

There exist several mnemonics to remember these bones:[2]

  • Some Lovers Try Positions That They Can't Handle.
  • Sally left the party / to take Cathy home.

Common characteristics of the carpal bones

Each bone (excepting the pisiform) presents six (6) surfaces.

Of these the palmar or anterior and the dorsal or posterior surfaces are rough, for ligamentous attachment; the dorsal surfaces being the broader, except in the lunate.

The superior or proximal, and inferior or distal surfaces are articular, the superior generally convex, the inferior concave; the medial and lateral surfaces are also articular where they are in contact with contiguous bones, otherwise they are rough and tuberculated.

The structure in all is similar: cancellous tissue enclosed in a layer of compact bone.

See also

Additional images

References

External links

cs:Kostra zápěstí de:Handwurzelknochen et:Randme luud it:Carpo he:עצמות שורש כף היד la:Carpus lt:Plaštaka nl:Handwortelbeen sl:Zapestna kost fi:Ranneluu sv:Handlov th:กระดูกข้อมือ uk:Зап'ястя



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