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# 甘皮は、どこにある？（where is the cuticle located?）
### **爪の部位：PNF・エポニキウム・甘皮の違い**
一般に「甘皮」は、目に見える薄い膜（cuticle）を指すことがほとんどですが、PNF・エポニキウム・甘皮を区別して、正確に理解することが重要です。
* #### **PNF（Proximal Nail Fold：後爪郭 / 近位爪郭）**
爪の根元にある皮膚の折り返し全体を指す生きた皮膚です。 主な役割は、爪母（爪が生まれる大事な基部）を外部の刺激・細菌から守ることです。
* #### **エポニキウム（Eponychium）**
PNFの下面（爪に接する側）にある薄い生きた皮膚層です。 ここから甘皮（cuticle）を生成します。生きた組織なので、ネイルケアでは基本的に切らずに守るべき部分です。
* #### **甘皮（Cuticle / 爪上皮 / ルースキューティクル）**
エポニキウムから排出される薄い死んだ角質の膜です。 爪の表面に貼り付き、PNFと爪の隙間を密封して細菌の侵入を防ぎます。 乾燥すると爪に強く張り付き、ささくれや見た目の悪化の原因になります。
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