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trapezoid bone
The trapezoid bone (lesser multangular bone) is a carpal bone in tetrapods, including humans. It is the smallest bone in the distal row. It may be known by its wedge-shaped form, the broad end of the wedge constituting the dorsal, the narrow end the palmar surface; and by its having four articular facets touching each other, and separated by sharp edges. It is homologous with the "second distal carpal" of reptiles and amphibians.
==Structure==
The trapezoid is a four-sided carpal bone found within the hand. The trapezoid is found within the distal row of carpal bones.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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