Name of bone



The pisiform bone (also called pisiform or lentiform bone) is a small knobbly, pea-shaped wrist bone found in the proximal row of the carpus. A sesamoid bone, the pisiform has its origins in the ulnar collateral ligament. It is located where the ulna (inner bone of the forearm when in anatomical position) joins the carpus (wrist).

The pisiform bone is known by its small size and by its single articular facet – it articulates only with the triquetral bone. It is situated on a plane anterior to the other carpal bones and is spheroidal in form.

The etymology derives from the Latin pisum which means “pea.”

Muscle and ligament attachments

Surface anatomy

  • 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 palmar surface is rounded and rough, and gives attachment to the transverse carpal ligament, the flexor carpi ulnaris, and the abductor digiti quinti.
  • The lateral and medial surfaces are also rough, the former being concave, the latter usually convex.

Figure 1. Surface anatomy of the pisiform bone


Physical examination





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