Affected Muscles:
- Occipitofrontalis - draws scalp anteriorly, raises eyebrow, wrinkles skin of forehead horizontally
- Orbicularis Oculi - closes eye
- Orbicularis Oris - closes and protrudes lips
- Buccinator - presses cheeks against teeth and lips
- Platysma - draws outer lower lip inferiorly and posteriorly
Mechanism of Muscle Weakness:
- A unilateral paralysis of the muscles of facial expression due to damage or disease of the facial (VII) nerve.
Other Symptoms:
- Changes in taste
- Sensitivity to sound
- Alteration in lacrimation and salivation