noun
mentalis muscle
Anatomical term for the muscle at the tip of the chin that elevates and protrudes the lower lip.
See also: オトガイ
オトガイ筋は下唇を突き出すときに働く。
The mentalis muscle works when you push out your lower lip.
Refers to the chin or mental region; オトガイ筋 is the muscle in that area.
Compound of オトガイ (chin, mental region) and 筋 (muscle). The exact origin of オトガイ is uncertain; it is a katakana anatomical term.