View source for Pisiform bone

{{Infobox Bone |
  Name          = Pisiform bone |
  Latin         = os pisiforme |
  GraySubject   = 54 |
  GrayPage      = 225 |
  Image         = Carpus.png |
  Caption       = '''BONES OF HAND'''<BR>''Proximal:'' A=[[Scaphoid bone|Scaphoid]], B=[[Lunate bone|Lunate]], C=[[Triquetral bone|Triquetral]], D=Pisiform<BR>''Distal:'' E=[[Trapezium bone|Trapezium]], F=[[Trapezoidium bone|Trapezoidium]], G=[[Capitate bone|Capitate]], H=[[Hamate bone|Hamate]]<BR> |
  Image2        = Gray224.png |
  Caption2      = The left pisiform bone. |
  Origins       = [[ulnar collateral ligament (thumb)|ulnar collateral ligament]] |
  Insertions    = |
  Articulations = [[triangular bone|triangular]]|
  MeshName      = Pisiform+Bone |
  MeshNumber    = A02.835.232.087.319.150.600 |
  DorlandsPre   = o_07 |
  DorlandsSuf   = 12598620  |
}}

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==Overview==
The '''pisiform bone''' (also called '''pisiform''' or '''lentiform bone''') is a small knobbly, pea-shaped [[wrist]] bone.

The pisiform bone is found in the proximal row of the [[carpus]]. It is located where the [[ulna]] (inner bone of the forearm) joins the [[carpus]] (wrist). It articulates only with the [[triquetral]]. 

It is a [[sesamoid bone]].

The pisiform bone may be known by its small size, and by its presenting a single articular facet. It is situated on a plane anterior to the other carpal bones and is spheroidal in form. 

The etymology derives from the Latin ''pīsum'' which means "pea."

==Surfaces==
Its ''dorsal surface'' presents a smooth, oval facet, for articulation with the triangular: this facet approaches the superior, but not the inferior border of the bone. 

The ''volar surface'' is rounded and rough, and gives attachment to the [[transverse carpal ligament]], and to the [[Flexor carpi ulnaris]] and [[Abductor digiti quinti muscle (hand)|Abductor digiti quinti]]. 

The ''lateral'' and ''medial surfaces'' are also rough, the former being concave, the latter usually convex.

==See also==
*[[Intercarpal articulations]]
*[[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.
 Image:Gray427.png|The muscles of the left hand. Palmar surface.
</gallery>

==External links==
* {{ViennaCrossSection|limbs/hand/hand-fr-1}}
* {{DartmouthAnatomy|wrist-hand/bones/bones4}}
* {{KansasHandKinesiology|bone/pisiform.html}}
* [http://www.pt.ntu.edu.tw/hmchai/Kines04/KINupper/Wrist.files/WristStructure.jpg Illustration at ntu.edu.tw]

[[Category:Skeletal system]]
[[Category:Wrist]]

{{Bones of upper extremity}}

{{SIB}}

{{WH}}

{{WS}}

[[es:Pisiforme]]
[[fr:Os pisiforme]]
[[ja:豆状骨]]
[[pl:Kość grochowata]]
[[pt:Osso pisiforme]]