The membranous labyrinth.
The receptors for the senses of equilibrium and hearing are housed within a collection of fluid filled tubes and chambers known as the membranous labyrinth. The membranous labyrinth is lodged within the bony labyrinth and has the same general form; it is, however, considerably smaller and is partly separated from the bony walls by a quantity of fluid, the perilymph.
In certain places, it is fixed to the walls of the cavity.
The membranous labyrinth is also the location for the receptor cells found in the inner ear.
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