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.
vestibulocochlear nerve, either of a pair of cranial nerves composed of fibers from the cochlear nerve and the vestibular nerve in the inner ear, conveying impulses of both the sense of hearing and the sense of balance.Also called acoustic nerve, eighth cranial nerve.estibulocochlear nerve the eighth cranial nerve, which emerges from the brain between the pons and medulla oblongata, behind the facial nerve.