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.
Anatomy. The chorda tympani nerve (branch of CN VII, the facial nerve) leaves the tongue with the lingual branch of the trigeminal nerve (CN V), separates from the lingual nerve and then travels through the middle ear where it is vulnerable to pathogens associated with ear infections (i.e., otitis media).he observation that dysgeusia (chronic taste sensations in the absence of stimulation) and intensified oral pain are associated with a history of otitis media is consistent with the damage to taste inflicted by otitis media. Strongest Pain of Any Kind.