Scala vestibuli, scala media and scala tympani of human ear respectively contain

The inner ear consists of the cochlea, which contains three fluid-filled canals: the scala media (membranous cochlear duct), scala vestibuli (vestibular duct), and scala tympani (tympanic duct). The scala media is filled with endolymph, while the scala vestibuli and scala tympani contain perilymph. These structures and fluids are essential for both hearing and balance functions of the inner ear.