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.
CN VII: Facial nerve: This nerve has both sensory and motor fibers. The sensory fibers start at the geniculate ganglion and exit the cranium at the internal acoustic meatus. The facial nerve transmits sensory impulses from the skin of the external acoustic meatus of the ear. It also carries the sense of taste from the anterior two-thirds of the tongue. The motor fibers of CN VII start at the pons and leave the cranium at the internal acoustic meatus.