1. Platysma
Origin: Fascia over the deltoid and pectoralis major muscles
Insertion: Mandible, blends with muscles around angle of mouth, and skin of the lower face
Action: Draws outer part of the lower lip inferiorly and posteriorly, tenses the skin of the neck, and depresses the mandible (showing tension or stress)
2. Mentalis
Origin: Mandible
Insertion: Skin of the chin
Action: Elevates and protrudes the lower lip (as in pouting), and pulls the skin of chin up
3. Orbicularis oris
Origin: Muscle fibers surrounding opening of 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 the frontal bone
Insertion: Skin of the eyebrow
Action: Draws eyebrow inferiorly, and wrinkles the skin of the forehead vertically (showing concern or worry)
5. Orbicularis oculi
Origin: Medial wall of orbit
Insertion: Circular path around orbit
Action: Closes the eyelids (as in winking)
6. Occipitofrontalis
Origin: Epicranial aponeurosis
Insertion: Skin superior to the supraorbital margin
Action: Draws scalp anteriorly, raises eyebrows, and wrinkles skin of forehead horizontally (showing surprise)