Injury or impairment in a given branch of the nerve can therefore result in:
Frontal: Paralysis of the forehead/inability to move the eyebrow. Usually, this means the eyebrow ‘hangs down’ in front of the eye and can impair vision
Frontal: Paralysis of the forehead/inability to move the eyebrow. Usually, this means the eyebrow ‘hangs down’ in front of the eye and can impair vision
Zygomatic: Difficulty with forceful eye closure.
Buccal: Difficulty with smiling and motion of the mouth. This leads to problems with speech, particularly sounds like “bee” and “papa,” where precise motion of the lips is required to articulate the sound. Food or liquid may fall out of the mouth unexpectedly due abnormal lip movement. In addition, there can be difficulty with nasal obstruction on the affected side as the muscles that help keep the nostril open may be paralyzed, resulting in an obstructed nostril. Normal blinking may be slowed or absent.
Marginal mandibular: the muscles it innervates are involved with downward motion of the corner of the mouth. Injury here may result in an asymmetric smile and problems with eating and drinking.
Cervical: This is arguably the least important of the branches. Injury of this nerve results in paralysis of the platysma muscle, a thin sheet that lies just deep to the skin. This may cause lower lip asymmetry during smile in some patients.
What are the causes of facial paralysis? Category Includes Annual Incidence Percentage Idiopathic Bell’s Palsy 75,396 49.6 Infectious Lyme disease, Otitis media 23,222 15.3 Neoplastic Acoustic Neuroma, Parotid malignancy 20,508 13.5 Neurologic Stroke, Guillan Barre 20,508 13.5 Traumatic Temporal bone fracture, birth trauma 12,365 8.1 Total 151,999
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