Diagnostic Service - Facial Nerve
The facial nerve (the labyrinthine segment) is the seventh cranial nerve, or simply CN VII. It emerges from the pons of the brainstem, controls the muscles of facial expression, and functions in the conveyance of taste sensations from the anterior two-thirds of the tongue.
There are numerous causes of facial nerve disorder: Trauma such as birth trauma, skull base fractures, facial injuries, middle ear injuries, or surgical trauma. Nervous system disease including stroke involving the brain stem. Infection of the ear or face, or herpes zoster of the facial nerve (Ramsay Hunt syndrome)