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Pisiform bone

The carpal bones of the hand are divided into a proximal row (four bones) and a distal row (four bones).

The pisiform bone is one of the bones of the proximal row of carpal bones and sits a top the palmar surface of the triquetrum bone. Pisiform is derived from the Latin word 'pisum' which translates to mean pea, perfectly describing the appearance of this small pea-shaped bone.

The pisiform bone is a sesamoid bone which lies embedded within the flexor carpi ulnaris tendon, providing a smooth surface for it to glide over. It acts as an important attachment site for both the flexor carpi ulnaris and abductor digiti minimi muscles. 

Due to its anterior and superficial positioning, the pisiform bone does not contribute to the formation of the wrist joint but articulates solely with the triquetrum on the medial aspect of the hand. It contributes to the formation of the ulnar canal (Guyon canal) which provides a passage way for the ulnar nerve and artery

Terminology English: Pisiform bone
Latin: Os pisiforme
Location Proximal row of carpal bones 
Articulations Triquetrum bone 
Muscle attachments Flexor carpi ulnaris, abductor digiti minimi 
Functions A pulley for the flexor carpi ulnaris tendon, providing a smooth surface for the tendon to glide over, contributes to the formation of the ulnar canal

Take a closer look at the bones of the hand with the study unit below. 

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