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The ratio of elastic moduli of cochlear outer hair cells derived from osmotic experiments

J. Acoust. Soc. Am. Volume 99, Issue 2, pp. 1025-1028 (February 1996)

Issue Date: February 1996
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J. Tilak Ratnanather, Man Zhi, and William E. Brownell
Department of Otolaryngology—Head and Neck Surgery and Center for Hearing Sciences, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21205-2196

Aleksander S. Popel
Department of Biomedical Engineering, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21205-2196
Outer hair cells (OHCs) were subjected to three different hypo-osmotic challenges which induced shape changes in OHCs. The longitudinal and circumferential strains, epsilonz and epsilonc, respectively, were extracted from a morphometric analysis of video images of the cells. A value of epsilonz/epsilonc=–0.72 was obtained and was found to be independent of the applied osmotic gradient. Using an elastic isotropic membrane model for the OHC lateral wall, the ratio of the elastic shear modulus µ to the elastic area expansion modulus K was calculated yielding a value of 0.054. The contribution of this ratio to OHC mechanics is discussed. ©1996 Acoustical Society of America.
History: Received 10 August 1994; accepted 13 August 1995
Permalink: http://dx.doi.org/10.1121/1.414631

KEYWORDS and PACS

Keywords
PACS
  • 43.64.Bt
    Acoustics Physiological acoustics Models and theories of the auditory system
  • 43.64.Kc
    Acoustics Physiological acoustics Cochlear mechanics
  • 43.64.Ld
    Acoustics Physiological acoustics Physiology of hair cells
  • YEAR: 1996

PUBLICATION DATA

ISSN:
0001-4966 (print)  
Publisher:
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