笑しょう筋きん

noun

risorius muscle

Anatomical term for a facial muscle that draws the angle of the mouth laterally, used in smiling.

• 笑しょう筋きんは口こう角かくを外そと側がわに引ひく表ひょう情じょう筋きんの一ひとつです。

  The risorius muscle is one of the facial muscles that pulls the corner of the mouth outward.