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Related Concept Videos

Hair Cells01:22

Hair Cells

Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.
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

Updated: Jul 1, 2026

Cochlear Implant Surgery and Electrically-evoked Auditory Brainstem Response Recordings in C57BL/6 Mice
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Relationships between Intrascalar Tissue, Neuron Survival, and Cochlear Implant Function.

Donald L Swiderski1, Deborah J Colesa1, Aaron P Hughes1

  • 1Kresge Hearing Research Institute, Department of Otolaryngology-Head and Neck Surgery, Michigan Medicine, University of Michigan, Ann Arbor, MI, USA.

Journal of the Association for Research in Otolaryngology : JARO
|July 22, 2020
PubMed
Summary
This summary is machine-generated.

New bone and fibrous tissue around cochlear implants do not significantly impact function. Spiral ganglion neuron survival is more critical for electrical hearing outcomes in guinea pigs.

Keywords:
auditory prosthesiselectrically evoked compound action potentialsfibrosispsychophysical thresholdsspiral ganglion neurons

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Area of Science:

  • Otoacoustic Emissions
  • Neuroscience
  • Biomaterials

Background:

  • Fibrous tissue and new bone formation within the cochlear scalae are common after cochlear implantation.
  • This intrascalar tissue may impede cochlear implant function by altering electrical impedance and neural signaling pathways.

Purpose of the Study:

  • To investigate the relationship between intrascalar tissue formation and cochlear implant function.
  • To determine if intrascalar tissue or spiral ganglion neuron (SGN) survival is a stronger predictor of implant performance.

Main Methods:

  • Guinea pigs were used to model different conditions: normal hearing, neomycin-induced deafness, and neurotrophin-treated deafness.
  • Intrascalar tissue levels and spiral ganglion neuron (SGN) survival were assessed.
  • Five measures of cochlear implant function were evaluated in relation to tissue and SGN density.

Main Results:

  • Spiral ganglion neuron (SGN) density significantly affected four out of five functional measures.
  • The level of intrascalar tissue did not explain additional variation in implant function beyond what SGN density accounted for.

Conclusions:

  • Spiral ganglion neuron (SGN) survival appears to be a more critical factor in cochlear implant electrical hearing than intrascalar tissue presence.
  • Minimizing surgical trauma to reduce both SGN loss and tissue development may improve outcomes.
  • Further research in human subjects is needed to evaluate the impact of intrascalar tissue on complex auditory tasks.