Which membrane separates the cochlear duct from the scala tympani, and provides a surface on which the spiral organ rests?

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The basilar membrane separates the cochlear duct (or scala media) from the scala tympani and provides a surface on which the spiral organ (or organ of Corti) rests. The vestibular membrane is also known as the Reissner's membrane and separates the cochlear duct from the scala vestibuli. The tectorial membrane is a gel-like structure that covers the hair cells in the cochlea and is attached to the bony shelf above the basilar membrane. The cochlear membrane is not a recognized anatomical structure in the inner ear. The tympanic membrane, also known as the eardrum, separates the outer ear from the middle ear.

Which Membrane Separates the Cochlear Duct from the Scala Tympani