Analogy type question:
$(1)$ Inner ear : Vestibular apparatus :: Cochlea : .........
$(2)$ Organ of Corti : Hair cells :: Tectorial membrane : ........

(A) $(1)$ The vestibular apparatus is a part of the inner ear. Similarly,the cochlea is the part of the inner ear that contains the organ of Corti,which consists of three fluid-filled chambers: the scala vestibuli,scala media,and scala tympani.
$(2)$ The organ of Corti contains hair cells that act as auditory receptors. The tectorial membrane is a thin,elastic membrane that lies above the hair cells and plays a crucial role in the transduction of sound waves into nerve impulses.