Abstract
The cochlear aqueduct is a fine duct connecting the scala tympani with the subarachnoid space. Intraductal space is occupied by mesh-like connective tissue. The internal aperture which has a separating membrane opens at the inner ridge of the round window. The external aperture opens in the subarachnoid space at the inferior surface of the petrous pyramid. There is variation in its size among the reports. According to Palva and Dammert (1969) the diameters of the internal and external aperture are 0.1 mm and 1.0 mm respectively and the length is approximately 6 mm in both apertures. Newborns have a thicker duct than adults (Palva, 1970) and the lower animals also have a thicker duct.
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