<prompt> Schwannoma arises most frequently from:Vestibular NerveTrigeminal nerveCochlear NerveFacial Nerve  <response>: A schwannoma also known as acoustic neuroma, acoustic neurinoma, or acoustic neurilemoma is a benign, usually slow-growing tumor that develops from the vestibular nerves supplying the inner ear. The tumor comes from an overproduction of Schwann cells--the cells that normally wrap around nerve fibers like onion skin to help suppo and insulate nerves. As the vestibular schwannoma grows, it presses against the hearing and balance nerves, usually causing unilateral one-sided or asymmetric hearing loss, tinnitus ringing in the ear, and dizzinessloss of balance. It comprises 5-10 of all intracranial neoplasms in adults. Incidence peaks in the fifth and sixth decades and both sexes are affected equally. 