From lateral to medial and when viewed from anteriorly, the proximal row of bones consists of: the boat-shaped scaphoid, the lunate, which has a crescent shape, the three-sided triquetrum bone, and the pea-shaped pisiform (Fig. 7.94).
The pisiform is a sesamoid bone in the tendon of the flexor carpi ulnaris and articulates with the anterior surface of the triquetrum.