jillio
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This is not entirely correct. Sensorineural hearing losses are an ensemble of mulfunctions, involving the sensory structure (hairy cells for the most part, all the structure of the cochlea more generally) and/or the neural transmission of the signal to the brain. Actually the acoustic nerve transports the acoustic stimulation kept by the cochlear structures to the brain, it is not an actual part of the brain.
For the rest I agree, damage of the nerve is not so rare.
I did not state that the 8th cranial nerve was a part of the brain. It actually transmits stimuli to the brain stem, which in turn, relays that stimuli to the auditory cortex where, in individuals with normal auditory and neurological function, the stimuli is interpreted into a meaningful message. And there are cases of sensorineural losses in which damage to the 8th cranial nerve is the only pathology involved.