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The pisiform bone ( or ), also spelled pisiforme (from the Latin ''pisifomis'', pea-shaped), is a small knobbly, pea-shaped sesamoid bone that is found in the wrist. It forms the ulnar border of the carpal tunnel. ==Structure== The pisiform bone is a small sesamoid bone found in the proximal row of the wrist (carpus). It situated where the ulna joins the wrist, within the tendon of the flexor carpi ulnaris muscle.〔Tim D. White, Human Osteology, 2nd edition (San Diego: Academic Press, 2000)〕 It only has one side that acts as a joint, articulating with the triquetral bone. It is on a plane anterior to the other carpal bones and is spheroidal in form. The pisiform bone has four surfaces: # The ''dorsal surface'' is smooth and oval, and articulates with the triquetral: this facet approaches the superior, but not the inferior border of the bone. # The ''palmar surface'' is rounded and rough, and gives attachment to the transverse carpal ligament, the flexor carpi ulnaris and the abductor digiti quinti. # The ''lateral'' and ''medial surfaces'' are also rough, the former being concave, the latter usually convex. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「pisiform bone」の詳細全文を読む スポンサード リンク
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