The pisiform is a small, pea-shaped bone located in the wrist, specifically in the proximal row of the carpal bones. It sits on top of the triquetrum bone and is classified as a sesamoid bone, meaning it develops within a tendon. The pisiform plays a role in wrist movement and stability. This bone serves as an attachment point for several ligaments and muscles, including the flexor carpi ulnaris. Its position helps facilitate the function of the wrist, contributing to the overall dexterity of the hand, which is essential for activities involving the hand and fingers.