|
Muscle |
Origin |
Insertion |
Action |
|
1. Platysma |
Fascia over deltoid and pectoralis major muscles. |
Mandible, blends with muscles around angle of mouth, and skin of lower face. |
Draws outer part of lower lip inferiorly and posteriorly as in pouting; depresses mandible. |
|
2. Mentalis |
Mandible |
Skin of chin. |
Elevates and protrudes lower lip; pulls skin of chin up as in pouting. |
|
3. Orbicularis oris |
Muscle fiber surrounding opening of mouth. |
Skin at corner of mouth. |
Closes and protrudes lips, as in kissing; compresses lips against teeth; and shapes lips during speech. |
|
4.Corrugator supercilii |
Medial end of superciliary arch of frontal bone. |
Skin of eyebrow. |
Draw eyebrow inferiorly and wrinkles skin of forehead vertically as in frowning. |
|
5. Orbicularis oculi |
Medial wall of orbit. |
Circular path around orbit. |
Closes eye. |
|
6. Occipitofrontalis |
Epicranial aponeurosis |
Skin superior to supraorbital margin. |
Draws scalp anteriorly, raises eyebrows, and wrinkles skin of forehead horizontally as in look of surprise. |
Source: Tortora, G. J., & Derrickson, B. (2011). Principles of anatomy & physiology. (13th ed., pp. 376-377). Danvers, MA, Wiley.