1. MUSCLE: Platysma
ORIGIN: Fascia over deltoid and pectoralis major muscles
INSERTION: Mandible, blends with muscles around angle of mouth, and skin of lower face
ACTION: Draws outer part of lip inferiorly and posteriorly as in pouting; depresses mandible
2. MUSCLE: Mentalis
ORIGIN: Mandible
INSERTION: Skin of chin
ACTION: Elevates and protrudes lower lip and pulls skin of chin up, as in pouting
3. MUSCLE: Orbicularis oris
ORIGIN: Muscle fibers surrounding opening of mouth
INSERTION: Skin at corner of mouth
ACTION: Closes and protrudes lips, as in kissing; compresses lips against teeth; and shapes lips during speech
4. MUSCLE: Corrugator supercilii
ORIGIN: Medial end of superciliary arch of frontal bone
INSERTION: Skin of eyebrow
ACTION: Draws eyebrow inferiorly and wrinkles skin of forehead vertically as in frowning
5. MUSCLE: Orbicularis oculi
ORIGIN: Medial end of superciliary arch of frontal bone
INSERTION: Skin of eyebrow
ACTION: Draws eyebrow inferiorly and wrinkles skin of forehead vertically as in frowning
6. MUSCLE: Occipitofrontalis
ORIGIN: Epicranial aponeurosis
INSERTION: Skin superior to supraorbital margin
ACTION: Draws scalp anteriorly, raises eyebrows, and wrinkles skin of forehead horizontally as in look of surprise