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 lower 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 wall of orbit; Insertion: Circular path around orbit; Action: Closes eye
6. Muscle: Depressor anguli oris; Origin: Mandible; Insertion: Angle of mouth; Action: Draws angle of mouth laterally and inferiorly, as in opening mouth