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 the 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: Occipitofrontalis (Frontal belly)
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