1. 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 lower lip inferiorly and posteriously as in pouting; depresses mandible.
2. Mentalis
Origin: Mandible
Insertion: Skin of Chin
Action: Elevates and protrudes lower lip and pulls skin of chin up as in pouting.
3. Orbicularis oris
Origin: Muscle fibers surrounding opening of mouth.
Insertion: Skinat corner of mouth.
Action: Closes and protrudes lips, as in kissing; compresses lips against teeth; and shapes lips during speech.
4. 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. Orbicularis oculi
Origin: Medial wall of orbit.
Insertion: Circular path around orbit.
Action: Closes eye
6. Occipitofrontalis (Frontal belly)
Origin: Epicranial aponeurosis.
Insertion: Skin superior to supraorbital margin.
Action: Draws scalp anteriorly, raises eyebrow, and wrinkles skin of forehead horizontally as in look of surprise.