The labyrinth is the fluid-filled inner ear. It consists of two parts, the bony and the membranous labyrinths.

The bony labyrinth is a series of channels, inside which lies the membranous labyrinth, which is
surrounded by a fluid called perilymph.

The membranous labyrinth is filled with a fluid called endolymph. The coiled portion of the labyrinth is called cochlea.