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Medical Definition of Macula cribrosa
1. One of three areas on the wall of the vestibule of the labyrinth, marked by numerous foramina giving passage to nerve filaments supplying portions of the membranous labyrinth, macula cribrosa inferior, located in the posterior bony ampulla for passage of posterior ampullary nerve fibres, macula cribrosa media, area near the base of the cochlea through which the saccular nerve fibres pass, macula cribrosa superior, perforated area above the elliptical recess for passage of the utriculoampullary nerve fibres, macula cribrosa quarta, a name sometimes applied to the opening for the cochlear nerve. (05 Mar 2000)