Pisiform

The pisiform bone is one of the four bones that comprise the proximal row of the carpus or carpal bones that form the wrist. It is the smallest of the carpal bones, is spheroidal in shape, and presents with only one articular surface (see image).

Its name originates from the Latin [pisum], meaning "pea". It is also known as "os pisiforme" or "lentiform bone", because some feel it is shaped like a lentil.

The pisiform bone articulates posteriorly with the triquetrum, and has on its anterior (volar) surface attachments to the transverse carpal ligament, and to the Abductor Digiti Quinti, and Flexor Carpi Ulnaris muscles.

The accompanying image shows the anterior (volar) surface of the wrist. Click on the image for a larger picture.

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Scaphoid bone - anterior (volar) view of the wrist

Image modified from the original: "3D Human Anatomy: Regional Edition DVD-ROM." Courtesy of Primal Pictures