membranous labyrinth

membranous labyrinth [L, membrana + labyrinthos, a maze] , a network of three fluid-filled membranous semicircular ducts suspended within the bony semicircular canals of the inner ear, associated with the sense of balance. The ducts, which contain endolymph, follow the contours of the bony canals and are about one fourth of the diameter of the canals.