1) Platysma
Origin: Fascia over deltoid and pectoralis major muscles.
Insertion: Mandible, blends with muscles around the angle of the mouth, and skin of the lower face
Action: Draws outer part of lower lip inferiorly and posteriorly as in pouting; depresses mandible.
2) Mentalis
Origin: Mandible
Insertion: Skin of chin
Action: Elevates and protrudes lower lip and pulls the skin of chin up, as in pouting
3) Orbicularis Oris
Origin: Muscle fibers surrounding the opening of the mouth
Insertion: Skin at the corner of the 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
Origin: Occipital belly (occipitalis), frontal belly (frontalis)
Insertion: Skin superior to supraorbital margin.
Action: Draws scalp anteriorly, raises eyebrows, and wrinkles skin of forehead horizontally as in the look of surprise.