As the stapes footplate moves into the oval window, the round window membrane moves out, and this allows movement of the fluid within the cochlea, leading to movement of the cochlear inner hair cells and thus hearing. The stapes bone transmits movement to the oval window. The entrance to the round window niche is often much smaller than this. This ensures that hair cells of the basilar membrane will be stimulated and that audition will occur.īoth the oval and round windows are about the same size, approximately 2.5 square millimetres (0.0039 sq in). The membrane vibrates with opposite phase to vibrations entering the cochlea through the oval window as the fluid in the cochlea is displaced when pressed by the stapes at the oval window. an internal, from the lining membrane of the cochlea.an external, or mucous, derived from the mucous lining of the tympanic cavity.The visible central portion is concave (curved inwards) toward the tympanic cavity and convex (curved outwards) toward the cochlea but towards the edges, where it is hidden in the round window niche, it curves the other way. It is located at the bottom of a funnel-shaped depression (the round window niche) and, in the macerated bone, opens into the cochlea of the internal ear in the fresh state it is closed by a membrane, the secondary tympanic membrane (Latin: membrana tympani secundaria, or membrana fenestrae cochleae) or round window membrane, which is a complex saddle point shape. The round window is situated below (inferior to) and a little behind (posterior to) the oval window, from which it is separated by a rounded elevation, the promontory. It allows fluid in the cochlea to move, which in turn ensures that hair cells of the basilar membrane will be stimulated and that audition will occur. It is sealed by the secondary tympanic membrane (round window membrane), which vibrates with opposite phase to vibrations entering the inner ear through the oval window. The round window is one of the two openings from the middle ear into the inner ear.
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