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.
Full Answer. The cochlea is a bony structure containing two fluids, the endolymph and the perilymph, states the ASHA. The inner ear has a sensory receptor inside the cochlea called the Organ of Corti. It is responsible for holding the hair cells, which are the nerve receptors for hearing.