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Related Concept Videos

The Cochlea01:13

The Cochlea

The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.

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Related Experiment Video

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Cochlear Surface Preparation in the Adult Mouse
09:51

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Published on: November 6, 2019

Sharpened cochlear tuning in a mouse with a genetically modified tectorial membrane.

Ian J Russell1, P Kevin Legan, Victoria A Lukashkina

  • 1School of Life Sciences, University of Sussex, Falmer, Brighton, BN1 9QG, UK. I.J.Russell@sussex.ac.uk

Nature Neuroscience
|January 16, 2007
PubMed
Summary

The tectorial membrane

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Cochlear Implant Surgery and Electrically-evoked Auditory Brainstem Response Recordings in C57BL/6 Mice

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Area of Science:

  • Auditory Neuroscience
  • Biochemistry
  • Biophysics

Background:

  • Cochlear frequency tuning relies on the basilar membrane's mechanics and outer hair cell feedback.
  • Outer hair cells' hair bundles are embedded in the tectorial membrane, an extracellular matrix crucial for hearing.
  • The tectorial membrane's unique matrix contains alpha-tectorin (Tecta) and beta-tectorin (Tectb) glycoproteins.

Purpose of the Study:

  • Investigate the role of beta-tectorin (Tectb) in the tectorial membrane's structure and function.
  • Determine the impact of disrupted tectorial membrane matrix on cochlear mechanics and tuning.
  • Elucidate the tectorial membrane's contribution to high-frequency auditory sensitivity.

Main Methods:

  • Analysis of Tectb(-/-) mice with disrupted tectorial membrane structure.
  • Assessment of hearing loss and cochlear tuning in Tectb(-/-) mice.
  • Evaluation of basilar membrane and neural tuning characteristics.

Main Results:

  • Tectb(-/-) mice exhibit disrupted tectorial membrane striated-sheet matrix.
  • These mice show low-frequency hearing loss but enhanced high-frequency basilar-membrane and neural tuning.
  • Sensitivity loss in high frequencies was minimal.

Conclusions:

  • Beta-tectorin (Tectb) is essential for the tectorial membrane's structural integrity.
  • A reduced tectorial membrane mass in Tectb(-/-) mice enhances high-frequency tuning.
  • The tectorial membrane plays a previously unrecognized role in regulating cochlear interactions and tuning.