Facial Expression (actions)

Draws angle of mouth laterally in expressions of laughing, horror, or disdain

Elevates angle of mouth as in smiling

Elevates upper lip, exposes teeth in smiling or sneering

Elevates and protrudes lower lip in drinking, pouting, and expressions of doubt or disdain; elevates and wrinkles skin of chin

Draws angle of mouth laterally and downward in opening mouth or sad expressions

Encircles mouth, closes lips, protrudes lips as in kissing; uniquely developed in humans for speech

Elevates upper eyelid; opens eye

Draws angle of mouth upward and laterally in laughing

sphincter of the eyelids; closes eye in blinking, squinting, and sleep; aids in flow of tears across eye

Draws eyebrows medially and downward in frowning and concentration; reduces glare of bright sunlight