Micromechanical Basis of High-Frequency Tuning in the Bobtail Lizard

  • Geoffrey A. Manley
  • Christine Köppl
  • Graeme K. Yates
Part of the NATO ASI Series book series (NSSA)


To date, a good understanding of the mechanisms of frequency selectivity has been achieved for the auditory papillae of the red-eared turtle (Crawford and Fettiplace, 1981), the alligator lizard (Weiss and Leong, 1985) and mammals (Khanna and Leonard, 1982; Russell and Sellick, 1978; Sellick et al., 1982). However, none of the three types of models proposed are directly applicable to the other cases. In the red-eared turtle, tuning seems to be mainly a function of the electrical properties of individual hair cells, whereas in the alligator lizard at least the high-frequency hair cells seem to be tuned by the resonance properties of individual hair-cell stereovillar bundles. Mammalian hair cells, however, show no indication of being electrically tuned and are covered by a thick tectorial membrane which, at least for outer hair cells, does not allow individual hair cell bundles to resonate independently. The mechanisms of frequency selectivity in vertebrate inner ears are obviously quite diverse (Manley, 1986), so that a comprehensive and comparative understanding of tuning mechanisms and their integration in the hearing organs of different vertebrate classes requires the detailed investigation of a greater variety of morphological types of inner ear.


Hair Cell Outer Hair Cell Basilar Membrane Tuning Curve Basal Segment 


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  1. Crawford, A.C. and Fettiplace, R. (1981) An electrical tuning mechanism in turtle cochlear hair cells. J. Physiol. 312, 377–412.PubMedGoogle Scholar
  2. Crawford, A.C. and Fettiplace, R. (1985) The mechanical properties of ciliary bundles of turtle cochlear hair cells. J. Physiol. 364, 359–379.PubMedGoogle Scholar
  3. Khanna, S.M. and Leonard, D. (1982) Basilar membrane tuning in the cat cochlea. Science 215, 305–306.PubMedCrossRefGoogle Scholar
  4. Köppl, C. (1988) Morphology of the basilar papilla of the bobtail lizard Tiliqua rugosa. in press.Google Scholar
  5. Manley, G.A. (1986) The evolution of the mechanisms of frequency selectivity in vertebrates. In: Auditory frequency selectivity (Eds: Moore, B.C.J. and Patterson, R.D.) Plenum press, New York, London, pp 63–72.Google Scholar
  6. Manley, G.A., Yates, G. and Köppl, C. (1988a) Auditory peripheral tuning: evidence for a simple resonance phenomenon in the lizard Tiliqua. Hearing Res. 33, 181–190.CrossRefGoogle Scholar
  7. Manley G A, Brix J, Gleich O, Kaiser A, Köppl C, Yates G (1988b) New aspects of comparative peripheral auditory physiology. In: Syka J (ed) Auditory System — Structure and function. Plenum Press, London, N.Y. in press.Google Scholar
  8. Russell, I. I. and Sellick, P.M. (1978) Intracellular studies of hair cells in the mammalian cochlea. J. Physiol. 284, 261–290.PubMedGoogle Scholar
  9. Sellick, P.M., Patuzzi, R. and Johnstone, B.M. (1982) Measurement of basilar membrane motion in the guinea pig using the Mössbauer technique. J. Acoust. Soc. Am. 72, 131–141.PubMedCrossRefGoogle Scholar
  10. Strelioff, D., Flock, A. and Minser, K.E. (1985) Role of inner and outer hair cells in mechanical frequency selectivity of the cochlea. Hearing Res. 18, 169–175.CrossRefGoogle Scholar
  11. Weiss, T.F. and Leong, R. (1985a) A model for signal transmission in an ear having hair cells with free-standing stereocilia. III. Micromechanical stage. Hearing Res. 20, 157–174.CrossRefGoogle Scholar
  12. Zwislocki, J.J., Slepecky, N.B. and Cefaratti, L.K. (1988) Tectorial-membrane stiffness and hair-cell stimulation. Abstr. 11th. Mtg. Assoc. Res. Otolaryngol. p.160.Google Scholar

Copyright information

© Plenum Press, New York 1989

Authors and Affiliations

  • Geoffrey A. Manley
    • 1
  • Christine Köppl
    • 1
  • Graeme K. Yates
    • 1
    • 2
  1. 1.Institut für ZoologieTechnischen Universität MünchenGarchingGermany
  2. 2.Department of PhysiologyUniversity of W. AustraliaNedlandsAustralia

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