<Ul> <Li> Three scalae or chambers: <Ul> <Li> the vestibular duct or scala vestibuli (containing perilymph), which lies superior to the cochlear duct and abuts the oval window </Li> <Li> the tympanic duct or scala tympani (containing perilymph), which lies inferior to the cochlear duct and terminates at the round window </Li> <Li> the cochlear duct or scala media (containing endolymph) a region of high potassium ion concentration that the stereocilia of the hair cells project into </Li> </Ul> </Li> <Li> The helicotrema, the location where the tympanic duct and the vestibular duct merge, at the apex of the cochlea </Li> <Li> Reissner's membrane, which separates the vestibular duct from the cochlear duct </Li> <Li> The basilar membrane, a main structural element that separates the cochlear duct from the tympanic duct and determines the mechanical wave propagation properties of the cochlear partition </Li> <Li> The Organ of Corti, the sensory epithelium, a cellular layer on the basilar membrane, in which sensory hair cells are powered by the potential difference between the perilymph and the endolymph </Li> <Li> hair cells, sensory cells in the Organ of Corti, topped with hair - like structures called stereocilia . </Li> </Ul> <Li> Three scalae or chambers: <Ul> <Li> the vestibular duct or scala vestibuli (containing perilymph), which lies superior to the cochlear duct and abuts the oval window </Li> <Li> the tympanic duct or scala tympani (containing perilymph), which lies inferior to the cochlear duct and terminates at the round window </Li> <Li> the cochlear duct or scala media (containing endolymph) a region of high potassium ion concentration that the stereocilia of the hair cells project into </Li> </Ul> </Li> <Ul> <Li> the vestibular duct or scala vestibuli (containing perilymph), which lies superior to the cochlear duct and abuts the oval window </Li> <Li> the tympanic duct or scala tympani (containing perilymph), which lies inferior to the cochlear duct and terminates at the round window </Li> <Li> the cochlear duct or scala media (containing endolymph) a region of high potassium ion concentration that the stereocilia of the hair cells project into </Li> </Ul> <Li> the vestibular duct or scala vestibuli (containing perilymph), which lies superior to the cochlear duct and abuts the oval window </Li>

What are the three chambers of the cochlea