Definition of cocaine. : a bitter crystalline alkaloid C17H21NO4 obtained from coca leaves that is used especially in the form of its hydrochloride medically as a topical anesthetic and illicitly for its euphoric effects and that may result in a compulsive psychological need.
The inner hair cells transform the sound vibrations in the fluids of the cochlea into electrical signals that are then relayed via the auditory nerve to the auditory brainstem and to the auditory cortex.
The vestibulocochlear nerve is a sensory nerve that conducts auditory and vestibular information from the inner ear to the brain.Auditory functions manage hearing, while vestibular functions serve to maintain balance and awareness of the body's position.nce referred to as the auditory or acoustic nerve, the vestibulocochlear nerve begins in the medulla oblongata, or the lower portion of the brain stem. It then travels alongside the facial nerve and enters the inner ear through the internal acoustic meatus, a hole in the temporal bone of the skull.