The reticular membrane (RM, also called reticular lamina or apical cuticular plate)[1] is a thin, stiff lamina that extends from the outer hair cells to the Hensen's cells.[2] The RM is composed of "minute-fiddle-shaped cuticular structures" called the phalangeal extensions of the outer hair cells, interspaced with extensions coming from the outer phalangeal cells.[3] The RM separates endolymph in the cochlear duct from underlying corticolymph and perilymph of the scala tympani.[1]