The nail covering parts 7 may be formed on the whole of the finger tips including its palm side as well as being formed at the back side finger tip parts.
爪被覆部７は、甲側指先部分に設けるのみならず、掌側も含めて指先全体に形成することもできる。

http://ejje.weblio.jp/sentence/content/be+tip+back+as