masculus risorius (English spelling) masculusrisorius

Japanese: masculus risorius(英語表記)masculusrisorius
masculus risorius (English spelling) masculusrisorius

…the skin dimples that appear on the face when laughing, especially around the corners of the mouth. It is thought that this occurs when the facial muscles, especially the masculus risorius, which is attached to the underside of the skin, push aside the layer of subcutaneous fat and pull the skin in when they contract. This idea also explains why this is common in children and women, who have thick subcutaneous fat on their faces and soft skin. …

*Some of the terminology that mentions "masculus risorius" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…笑ったとき,ほほえんだときなどに顔面,とくに口角の周辺に出る皮膚のくぼみ。これは表情筋,とくに笑筋masculus risoriusとよばれる筋が皮膚の裏面に付いており,この筋の収縮に際して,皮下脂肪の層をかきわけて皮膚を引きこむために生じると考えられている。顔面の皮下脂肪が厚く,皮膚そのものは柔らかな子どもや女性によく現れることも,この考えから説明できる。…

※「masculus risorius」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

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