osseous labyrinth [L, os, bone; Gk, labyrinthos, maze] , the bony part of the internal ear, which transmits sound vibrations from the middle ear to the eighth cranial nerve. It is composed of three cavities: the vestibule, the semicircular canals, and the cochlea, all of which contain perilymph, in which a membranous labyrinth is suspended. Also called labyrinthus osseus. Compare membranous labyrinth.
