The pisiform bone (also called pisiform or lentiform bone) is a small, pea-shaped carpal bone found in the proximal row of the carpus. It is located where the ulna joins the carpus (wrist). It articulates only with the triquetral.
It is a sesamoid bone.
Carpal Bones - Distal and Proximal Rows Proximal: A=Scaphoid, B=Lunate, C=Triquetral, D=Pisiform Distal: E=Trapezium, F=Trapezoid, G=Capitate, H=Hamate
Surfaces and Articulations
Its dorsal surface presents a smooth, oval facet, for articulation with the triquetral.
Left Pisiform Bone, Triangular bone is another name for Triquetral
The palmar surface is rounded and rough, and gives attachment to the transverse carpal ligament, flexor carpi ulnaris, abductor digiti quinti.
The lateral and medial surfaces are also rough, the former being concave, the latter usually convex.
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