Uchimomo

…The former is further divided into the thigh and the lower leg above and below the knee. The thigh is commonly called “momo”, and the upper half is very thick, so it is called “thigh” and the inside is called “uchimomo”. The lower leg is called “hagi” or “sune” in the native Japanese language.…

*Some of the terminology that refers to "Uchimomo" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…前者はさらにひざの上下で大腿と下腿に分けられる。大腿は俗にいう〈もも〉で，その上半はひじょうに太いので〈ふともも〉，その内側を〈うちもも〉という。下腿は日本固有の言葉では〈はぎ〉または〈すね〉という。…

※「うちもも」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報