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: 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.
References:
Tortora, G. J., & Derrickson, B. (2017). Chapter 11: The Muscular System. In Principles of Anatomy and Physiology (15th edition). Wiley. Retrieved from https://www.google.com.ph/url?sa=i&rct=j&q=&esrc=s&source=web&cd=&ved=0CAIQw7AJahcKEwi4m_OvkpuBAxUAAAAAHQAAAAAQAg&url=https%3A%2F%2Fhandoutset.com%2Fwp-content%2Fuploads%2F2022%2F05%2FPrinciples-of-anatomy-and-physiology-Wiley-2017-Derrickson-Bryan-H._-Tortora-Gerard-J..pdf&psig=AOvVaw3MGogf51os64NiWCtHEzVc&ust=1694266926809150&opi=89978449.