Definition: a small bone the size and shape of a pea, in the proximal row of the carpus, lying on the anterior surface of the triquetral, with which it articulates; it gives insertion to the tendon of the flexor carpi ulnaris muscle. Realistically, it is considered a sesamoid bone within the continuous flexor carpi ulnaris tendon and pisohamate ligament. It is unrepresented in the primitive carpalia.
Synonym(s): os pisiformeTA, lentiform bone
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