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; depresses mandible.
2. Muscle: Mentalis
Origin: mandible
Insertion: skin of chin
Action: elevates and protrudes lower lip and pulls chin skin up
3. Muscle: Orbicularis oris
Origin: muscle fibers surrounding mouth opening
Insertion: skin at the corner of the mouth
Action: closes and protrudes lips
4. Muscle: Corrugator supercilii
Origin: medial end of superciliary arch of the frontal bone
Insertion: skin of eyebrow
Action: draws eyebrows inferiorly and wrinkles of the forehead skin vertically
5. Muscle: Orbicularis oculi
Origin: Medial wall of orbit
Insertion: circular path around orbit
Action: closes eye
6. Muscle: Occipitofrontalis - Frontal Belly
Origin: epicranial aponeurosis
Insertion: skin superior to supraorbital margin
Action: draws scalp anteriorly, raises eyebrows, and wrinkles of forehead skin horizontally as in look of surprise.