Pisiform

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ΕΤΥΜΟΛΟΓΙΑ

Latin, 'pea-shaped'

The pisiform (lentiform) is one of the eight carpal bones found in the hand. Unlike the other carpal bones it articulates only with the triquetral, and equivalents are not found in many other mammals, suggesting that it is a more developed sesamoid bone. It is situated anterior to the plane of the other carpal bones, articulating with the palmar surface of triquetral.

Contents

Surface Anatomy

Pisiform
Pisiform.gif
Dorsal surface of the pisiform. Triangular refers to triquetral.
System: Skeletal system
Function:
Origin:
Branches:
Insertion:
Arterial supply:
Venous drainage:
Lymphatic drainage:
Innervation:
Vertebral levels:
Search for Pisiform in Gray's.

The pisiform may be felt at the base of the hypothenar eminence. When the wrist is flexed, flexor carpi ulnaris relaxes allowing the pisiform to be moved side to side. If the subject is thin, it may be seen as a bulge when the wrist is extended.

Shape

The pisiform is spherical, with a flat dorsal articular facet for the triquetral.

Attachments

Joints

Ossification

The pisiform ossifies in the ninth or tenth year in females and the twelfth in males.

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