GENERAL HISTOLOGY

Detailed explanation-1: -Bell’s palsy is the most common cause of facial paralysis, although its exact cause is unknown. It results from dysfunction of cranial nerve VII, which connects your brain to the muscles that control facial expression (the nerve also is involved with taste and ear sensation).

Detailed explanation-2: -Bell palsy is a disorder of the nerve that controls movement of the muscles in the face. This nerve is called the facial or seventh cranial nerve. Damage to this nerve causes weakness or paralysis of these muscles. Paralysis means that you cannot use the muscles at all.

Detailed explanation-3: -Other causes of peripheral seventh nerve palsy include: neoplasm, trauma, middle ear infections, parotid gland surgery, granulomatous or carcinomatous meningitis, and diabetes. The disturbances of function produced by these lesions need not be complete.

Detailed explanation-4: -The facial nerve is the seventh cranial nerve (CN VII). It arises from the brain stem and extends posteriorly to the abducens nerve and anteriorly to the vestibulocochlear nerve.

Detailed explanation-5: -Buccal branch (orbicularis pros, buccinator, and zygomatic muscles (around lips, cheeks, and corners of the mouth)) Marginal mandibular branch (mentalis muscle (lower lip and chin))