Pisiform

Description

Normal anatomy of the carpal bones. Diagram of the wrist (frontal view) shows the eight carpal bones and the three carpal arcs (Gilula arcs), which are shown as pink (arc I), blue (arc II), and red (arc III) lines. C (capitate), H (hamate), L (lunate), P (pisiform), S (scaphoid), Tm (trapezium), Td (trapezoid), Tr (triquetrum)

Wrist radiograph with carpal bones labeled

General

• Spherical in shape.
• On the medial side of the proximal carpal bones row.
• Small in size and presents a single articular facet.

Anatomic Description

• Dorsal surface is flat and forms the piso-triquetral joint with the Triquetrum
• Palmar surface is rounded providing muscular attachment.

Muscular Attachments

• Flexor Carpi Ulnaris
• Abductor Digiti Minimi

Ligament Attachments

• Pisohamate Ligament
• Pisometacarpal Ligament
• Ulnar Pisotriquetral Ligament
• Transverse Carpal Ligament (flexor retinaculum)
• Radial Pisotriquetral Ligament

Vascular Supply

• Ulnar Artery

Innervation

• Anterior interosseous branch of the median nerve
• Posterior interosseous branch of the radial nerve
• Dorsal and the deep branches of the ulnar nerve

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Clinical Significance

• Pisiform Fracture

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See Also

• Hand and Wrist Anatomy (Main)
• Hand And Wrist Anatomy
• Wrist Pain (Main)

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