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Journal Article
Research Support, U.S. Gov't, P.H.S.
Radial communication between the perilymphatic scalae of the cochlea. II: Estimation by bolus injection of tracer into the sealed cochlea.
Hearing Research 1991 November
Radial communication between ST and SV was measured in the sealed cochlea by monitoring the dispersal of an ionic tracer, trimethylphenylammonium (TMPA) injected in the form of a minute bolus. Tracer movements were recorded by a pair of ion-selective electrodes sealed into the injected and non-injected scalae close to the injection site. Measurements were made in the basal or third turn of the guinea pig cochlea. In the third turn, radial communication occurred rapidly with a ST half time from ST to SV of 25 min and from SV to ST of 26 min. In the basal turn the communication was markedly slower, with a ST half time from ST to SV of 170 min and from SV to ST of 240 min. However, the difference between the basal and third turns can be shown to arise almost totally from differences in cross-sectional area of the perilymphatic scalae. When normalized with respect to scala cross-section, the process of tracer movement across the spiral ligament is similar in the basal and third turns. These results demonstrate that radial communication between scala tympani and scala vestibuli is an important route which must be considered in studies involving perilymph.
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