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Animal Sonar pp 307-310 | Cite as

The Efferent Auditory System in Doppler-Shift Compensating Bats

  • Allen L. Bishop
  • O. W. HensonJr.
Part of the NATO ASI Science book series (NSSA, volume 156)

Abstract

Studies on the innervation of outer hair cells (OHCs) of common laboratory animals have repeatedly demonstrated a general pattern of efferent terminals throughout the cochlea (Smith and Sjöstrand, 1961; Iurato et al., 1978; Spoendlin, 1979). Many efferent endings typically contact each OHC in the basal turn of the cochlea and the number decreases in more apical regions, particularly on the outermost rows. The present study on the efferent innervation of outer hair cells in different species of Doppler-shift compensating bats has revealed marked interspecies differences as well as striking departures from the basic plan known to occur in common laboratory animals. Studies were carried out on the cochlea of the neotropical mormoopid, Pteronotus p. parnellii and on the Old World rhinolophids, Rhinolophus rouxi and Hipposideros lankadiva. The rhinolophids and P. parnellii have independently evolved sophisticated biosonar systems; although the frequency resolving properties of their ears are similar, marked structural and physiological differences exist (Bruns, 1980; Kössl and Vater, 1985; Henson et al., 1985).

Keywords

Outer Hair Cell Basilar Membrane Basal Turn Efferent Ending Efferent Terminal 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Bruns, V. (1980 Basilar membrane and its anchoring system in the cochlea of the greater horseshoe bat. Anat. Embryol. 161: 29–50.PubMedCrossRefGoogle Scholar
  2. Bruns, V. and Schmieszek, E. (1980) Cochlear innervation in the greater horseshoe bat: demonstration of an acoustic fovea. Hearing Res. 3: 27–43.CrossRefGoogle Scholar
  3. Guinan, J.J., Jr. (1986) Effect of efferent neural activity on cochlear mechanics. Scand. Audiology (in press).Google Scholar
  4. Henson, O.W., Jr., Schuller, G., and Vater, M. (1985) A comparative study of the physiological properties of the inner ear in Doppler shift compensating bats (Rhinolophus rouxi and Pteronotus P. parnellii). J. Comp. Physiol. A 157: 587–597.CrossRefGoogle Scholar
  5. Iurato, S., Smith, C.A., Eldredge, D.H., Henderson, D., Carr, C., Ueno, Y., Cameron, S., and Richter, R. (1978) Distribution of the crossed olivocochlear bundle in the chinchilla’s cochlea. J. Comp. Neurol. 182: 57–76.PubMedCrossRefGoogle Scholar
  6. Kossl, M. and Vater, M. (1985) The cochlear frequency map of the mustache bat, Pteronotus p. parnellii. J. Comp. Physiol. A 157: 687–697.PubMedCrossRefGoogle Scholar
  7. Siegel, J.H. and Kim, D.O. (1982) Efferent neural control of cochlear mechanics? Olivocochlear bundle stimulation affects cochlear bio-mechanical nonlinearity. Hearing Res. 6: 171–182.CrossRefGoogle Scholar
  8. Smith, C.A. and Sjostrand, F.A. (1961) Structure of the nerve endings on the external hair cells of the guinea pig cochlea as studied by serial sections. J. Ultrastraucture Res. 5: 523–556.CrossRefGoogle Scholar
  9. Spoendlin, H. (1966) The organization of the cochlear receptor. Adv. Otorhinolaryngol. 13: 1–226.Google Scholar
  10. Spoendlin, H. (1979) Sensory neural organization of the cochlea. J. Laryngol. Otol. 93: 853–877.PubMedCrossRefGoogle Scholar
  11. Warr, W.B. and Guinan, J.J., Jr. (1979) Efferent innervation of the organ of Corti: two separate systems. Brain Res. 173: 152–155.PubMedCrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1988

Authors and Affiliations

  • Allen L. Bishop
    • 1
  • O. W. HensonJr.
    • 1
  1. 1.Department of AnatomyThe University of North Carolina at Chapel HillChapel HillUSA

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