A movement of the head causes the displacement of the endolymph which acts on the auditory nerves.
In the adult the fluid present in this cavity is known as the endolymph.
The endolymph and the tiny grains of ear-sand now perform their part in this marvelous and complex mechanism.
The membranous bag itself contains a similar fluid, the endolymph.
endolymph en·do·lymph (ěn'də-lĭmf')
The fluid contained in the membranous labyrinth of the inner ear. Also called Scarpa's fluid.