Distinguish between:
$(1)$ Tectorial membrane and Reissner's membrane.

(N/A) Tectorial membrane: The organ of Corti is located on the basilar membrane,which contains hair cells. Above the rows of hair cells lies a thin,elastic membrane called the tectorial membrane.
Reissner's membrane: The cochlea of the internal ear contains a space called the scala media. The roof of the scala media is formed by Reissner's membrane.