Pisiform

Definition

The pisiform is a small, pea-shaped carpal bone located in the proximal row of the carpus, on the ulnar side of the hand. It articulates only with the triquetrum and acts as a sesamoid bone, embedded within the tendon of the flexor carpi ulnaris muscle.

Related terms

Carpus: The cluster of eight small bones that make up the wrist joint, allowing for a wide range of motion.

Sesamoid Bone:

A type of bone that is embedded within a tendon or muscle, functioning to protect tendons and increase their mechanical effect by altering the direction of muscle pull.

Triquetrum:

One of the carpal bones located in the proximal row next to the pisiform, it articulates with several bones including lunate and hamate, contributing to wrist flexibility