Fig. 2.

The 3D model of the guinea pig cochlea (fig. 1D) is based on the functions describing the change of cross-sectional area (CSA) for the fluid spaces of the ST and SV area along distance as published by Thorne et al. [1999] (open symbols) and their analytical approximation (lines). The following functions were fitted to the published cross-sectional area curves of SV and ST of the guinea pig cochlea:

$$f{\left(x\right)}_{\mathit{SV}}=a_1{x}^7+a_2{x}^6+\dots +a_{7}x+a_8,$$

$$f{\left(x\right)}_{\mathit{ST}}=a_1\frac{\ln (x+a_2)}{{(x+a_2)}^{a_3}}+a_4.$$

The constants a_i where chosen to fit the published data.