Generation of the endocochlear potential: a biophysical model |
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Authors: | Quraishi Imran H Raphael Robert M |
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Institution: | Department of Bioengineering, Rice University, Houston, Texas |
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Abstract: | The generation and maintenance of the endocochlear potential (EP) by the stria vascularis is essential for proper function of the cochlea. We present a mathematical model that captures the critical biophysical interactions between the distinct cellular layers that generate the EP. By describing the relationship between the K+ concentration in the intrastrial space and the intermediate cell transmembrane potential, we rationalize the presence of a large intermediate cell K+ conductance and predict that the intrastrial K+] is ∼4 mM at steady state. The model also predicts that the stria vascularis is capable of buffering the EP against external perturbations in a manner modulated by changes in intrastrial K+], thus facilitating hearing sensitivity across the broad dynamic range of the auditory system. |
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