(also pisiform bone)
A small rounded carpal bone situated where the palm of the hand meets the outer edge of the wrist and articulating with the triquetral.
- The motor branch to the hypothenar muscles separates from the main ulnar nerve just distal to the pisiform at the wrist.
- The nerve recombined also beyond the tendon and was subject to compression, proximal to the pisiform bone.
- The flexor carpi ulnaris inserts on the pisiform.
Mid 18th century: from modern Latin pisiformis 'pea-shaped', from pisum 'pea' + forma 'shape'.
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Line breaks: pisi|form
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