Mia Joy Q. Formalejo
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 posteriorly as in pouting; depresses mandible
2. Mentalis
Origin: Mandible
Insertion: Underneath skin of chin
Action: Elevates and protudes lower lip and pulls skin of chin up; as in frowning
3. Orbicularis oris
Origin: Muscle fibers surrounding the opening of the mouth
Insertion: Slom at corner of the mouth
Action: Closes and protudes lips; as in kissing
4. Corrugator supercili
Origin: Medial end of superciliary arch of frontal bone
Insertion: Skin of eyebrow
Action: Draws eyebrow inferorly
5. Orbicularis oculi
Origin: Medial wall of orbit
Insertion: Circular path around orbit
Action: Closes eye
6. Occipofrontalis
Origin: Epicranial Aponeurosis
Insertion; Skin superior to supraorbital margin
Action: Wrinkles skin of forehead horizontally