Facial muscles are the muscles in your face that help you make different expressions, like smiling or frowning. They control the movements of your mouth, eyes, and other parts of your face. Full definition
What's unusual about their latest work is that it involves color changes that communicate emotion without any movement of facial muscles. (sciencedaily.com)
The study made comparisons based on facial muscle movements. (sciencedaily.com)
A baby uses 40 different facial muscles when breastfeeding! (themilkmeg.com)