Basilar membrane


![Sinusoidal drive through the oval window (top) causes a traveling wave of fluid–membrane motion. A modeled snapshot of fluid streamlines is shown. The wavelength is long compared to the duct height near the base, in what is called the long-wave region, and short (0.5 to 1.0 mm in typical observations[4][5]) near the place where the displacement and velocity are maximized, just before cutoff, in the short-wave region.](/Images/godic/202501/23/Cochlea_Traveling_Wave4433.png")
The basilar membrane within the cochlea of the inner ear is a stiff structural element that separates two liquid-filled tubes that run along the coil of the cochlea, the scala media and the scala tympani (see figure).
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