1. The cochlea lies in the inner ear. The cocheal is a coiled portion consisting of 3 chamers namely: scala vestibuli and Scala tympani - these two are filled with perileymph, and the Scala media is filled with endolymph.
2. At the base of cochlea, the Scala vstibule ends at the oval window whereas the scala tympani ends at the round window of the middle ear.
3. The chambers scala vestibuli and scala media are separated by a membrane called Reisner's membrane whereas the Scala media and scala tympani are separated by a membrane called Basilar membrane.
Organ of corti :
1. The organ of corti is a sensory ridge located on the top of the Basilar membrane and it contains numerous hair cells that are arranged in four rows along the length of the basilar membrane.
2. Proturding from the apical part of each hair cell is hair like structure known as stereochillia.
3. During the conduction of sound wave, stereocilia makes a contact with the stiff gel membrane called tectorial membrane, a roof like structure overchanging the organ of corti throughout its length
