The two functions of the reticular lamina

Alessandro Altoè, Ville Pulkki, Sarah Verhulst

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Abstract

The cell body of the outer hair cells connects the reticular lamina and the basilar membrane through supporting cells. According to the predominant view of cochlear mechanics, the outer hair cells enhance wave propagation in the scala media by dynamically expanding and contracting their body, thus providing an active driving force to the basilar membrane. In order to maximize the efficiency of such mechanism, the reticular lamina should behave like a rigid anchor; in this way the force associated with the length change of the outer hair cells body is efficiently transmitted to the basilar membrane. On the other hand, the motion of the reticular lamina provides a direct drive to the inner-hair cells through a fluid-cilia coupling mechanism. Therefore a free-to-move reticular lamina would be highly responsive to the activity of outer hair cells, thus locally enhancing the sensitivity of inner hair cells. Within this view, the reticular lamina should trade-off between the two conflicting requirements of 1) providing a firm attachment to the outer hair cells and 2) being sensitive to outer hair cells motility. A different thesis, partially supported by recent recordings of the intact organ of Corti, is that a longitudinal coupling of motion in the scala media (similar as in feed-forward cochlear models) allows for a simultaneous enhancement of basilar membrane and stereocilia vibrations without imposing contradicting requirements for the functioning of the reticular lamina. In this study, we discuss the recent experimental and theoretical findings under this perspective.

Original languageEnglish
Title of host publicationProceedings of the 23rd International Congress on Sound and Vibration: From Ancient to Modern Acoustics, ICSV 2016
EditorsKonstantinos Vogiatzis, Georges Kouroussis, Malcolm Crocker, Marek Pawelczyk
PublisherInternational Institute of Acoustics and Vibrations
Number of pages5
ISBN (Electronic)9789609922623
Publication statusPublished - 2016
MoE publication typeA4 Article in a conference publication
EventInternational Congress on Sound and Vibration - Athens, Greece
Duration: 10 Jul 201614 Jul 2016
Conference number: 23

Conference

ConferenceInternational Congress on Sound and Vibration
Abbreviated titleICSV
CountryGreece
CityAthens
Period10/07/201614/07/2016

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    Altoè, A., Pulkki, V., & Verhulst, S. (2016). The two functions of the reticular lamina. In K. Vogiatzis, G. Kouroussis, M. Crocker, & M. Pawelczyk (Eds.), Proceedings of the 23rd International Congress on Sound and Vibration: From Ancient to Modern Acoustics, ICSV 2016 International Institute of Acoustics and Vibrations. http://www.iiav.org/archives_icsv_last/2016_icsv23/content/papers/papers/full_paper_302_20160427152612544.pdf