|
MUSCLE |
ORIGIN |
INSERTION |
ACTION |
|
1. Platysma |
Fascia over deltoid and pectoralis major muscles
|
Mandible, blends with muscles around the angle of the mouth, and skin of the lower face |
Mandible depression, draws outer part of lower lip inferiorly and posteriorly |
|
2. Mentalis |
Mandible |
Skin of chin |
Elevates and protrudes lip, pulls skin of chin up (pouting) |
|
3. Orbicularis oris |
Muscle fibers surrounding the opening of the mouth |
Skin at corner of mouth |
Closes and protrudes lips (kissing); compresses lips against teeth, shapes lips during speech |
|
4. Corrugator supercilli |
Medial end of the superciliary arch of the frontal lobe |
Skin of eyebrow |
Draws eyebrows inferiorly, wrinkles the skin of forehead vertically |
|
5. Orbicularis oculi |
Orbit’s medial wall |
Circular path around the orbit |
Closes eye |
|
6. Occipitofrontalis |
Epicranial aponeurosis |
Skin superior to supraorbital margin |
Draws scalp anteriorly and raises eyebrows; wrinkles skin of forehead horizontally |