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Updated: May 25, 2025
These lie side by side and are named, from their relations to other parts, the scala vestibula, the scala tympani, and the scala media. *The Scala Vestibula and the Scala Tympani* appear in cross section as the larger of the canals. The former, so named from its connection with the vestibule, occupies the upper position in all parts of the coil.
*The Scala Media.*—This division of the cochlea lies parallel to and between the other two divisions. It is above the scala tympani and below the scala vestibula, and is separated from each by a membrane. The scala media belongs to the membranous portion of the internal ear and is, therefore, filled with the endolymph.
Both the scala vestibula and the scala tympani belong to the outer portion of the internal ear and are, for this reason, filled with the perilymph. At their upper ends they communicate with each other by a small opening, making by this means one continuous canal through the cochlea. This canal passes from the vestibule to the tympanum and, in so doing, goes entirely around
The connection of the scala vestibula with the scala tympani, and this with the middle ear, is necessary for the passage of vibrations through the internal ear. Its liquids, being practically incompressible and surrounded on all sides by bones, could not otherwise yield to the movements of the stapes. *Detection of Pitch.*—The method of detecting tones of different pitch is not understood.
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