FOR A NUMBER of years it has been known that an anatomical connection exists between the subarachnoid spaces of the brain and the perilymphatic system of the inner ear in the form of the cochlear aqueduct. Several investigators, among them Meurman,1 Kobrak,2 and Ahlen,3 have demonstrated that pressure applied indirectly to the cerebrospinal fluid surrounding the brain will produce a flow of cerebrospinal fluid through the cochlear aqueduct into the scala tympani. In general, the technique used in the past to ascertain whether or not increases in cerebrospinal fluid pressure affected the cochlea was application of pressure at some point in contact with the cerebrospinal fluid system, such as the meninges, and direct observation of any flow created in the cochlear aqueduct. Kobrak2 attempted to increase the cerebrospinal fluid pressure directly but was unable to successfully cannulate the subdural space.
Allen and Habibi4 in 1961
FELDMAN RM, ALLEN GW. Effects of Cerebrospinal Fluid Pressure on the Cat Cochlea. Arch Otolaryngol. 1966;84(4):422–425. doi:10.1001/archotol.1966.00760030424010
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