甲弧影(英語:lunula),是指指(趾)甲近端的白色半月形區域。甲弧影是甲母質生發細胞在指(趾)甲遠側增生的標示[1]

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拇指的甲弧影最大,越向小指甲弧影越小[2]。甲弧影處皮膚所含水分較多,未完全形質化,顯現不出血液顏色,故而呈白色[3]

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