Model of the Displacement between Opposing Points on the Tectorial Membrane and Reticular Lamina

Abstract

A quantitative model of the relative motion between the tectorial membrane and reticular lamina of the mammalian cochlea is presented. The model is proposed for the stapes side of the region of maximum deflection during sinusoidal excitation. Based on familiar concepts, the model assumes that basilar membrane deflection causes a sliding motion between the tectorial membrane and the reticular lamina. Equations for the motion between opposing points on these two structures are derived in terms of various cochlear dimensions and of the basilar-membrane displacement. Average values of these dimensions, obtained from eight cat ears, were used to achieve numerical answers.