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The Cochlea

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: Jan 1, 2026

Author Spotlight: Optimizing EAS with Long Electrodes for Enhanced Cochlear Coverage and Hearing Preservation

Author Spotlight: Optimizing EAS with Long Electrodes for Enhanced Cochlear Coverage and Hearing Preservation

Published on: October 11, 2024

Cochlear Microphonics in Hearing Preservation Cochlear Implantees.

Artur Lorens¹, Adam Walkowiak¹, Marek Polak²

¹Institute of Physiology and Pathology of Hearing, World Hearing Center, Kajetany, Poland.

The Journal of International Advanced Otology

|December 18, 2019

Summary

This summary is machine-generated.

For cochlear implant (CI) users with residual hearing, 500 Hz or 1k Hz tone pips are most sensitive for recording cochlear microphonics (CM). Optimal CM recording location depends on tone frequency and electrode insertion depth.

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Last Updated: Jan 1, 2026

Author Spotlight: Optimizing EAS with Long Electrodes for Enhanced Cochlear Coverage and Hearing Preservation

Author Spotlight: Optimizing EAS with Long Electrodes for Enhanced Cochlear Coverage and Hearing Preservation

Published on: October 11, 2024

Author Spotlight: Advancements in Impedance Monitoring for Cochlear Implant Surgery

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Published on: August 4, 2023

Performing Intracochlear Electrocochleography During Cochlear Implantation

Performing Intracochlear Electrocochleography During Cochlear Implantation

Published on: March 8, 2022

Area of Science:

Audiology
Neuroscience
Biomedical Engineering

Background:

Intracochlear electrocochleography (ECoG) allows direct recording of cochlear microphonics (CM) from cochlear implant (CI) electrodes in individuals with residual hearing.
Understanding optimal recording parameters is crucial for monitoring cochlear health in CI users.

Purpose of the Study:

To determine the most sensitive frequency for recording CM in CI users with diverse hearing abilities and deep electrode insertions.
To identify the optimal cochlear location for recording intracochlear potentials.

Main Methods:

CMs were recorded using CI electrodes in 16 participants (8 male, 8 female) implanted with Med-El Pulsar, Concerto, or Sonata devices.
Various tone pip frequencies were used to assess CM amplitude and location.

Main Results:

The most sensitive frequencies for CM recording in CI users were 500 Hz and 1k Hz.
The optimal recording site within the cochlea varied with tone frequency.
Deeper electrode insertion correlated with lower stimulating frequencies for maximal CM amplitude.

Conclusions:

The identified optimal recording parameters for intracochlear CM are valuable for intraoperative and postoperative monitoring of cochlear health.
This research aids in assessing residual hearing and implant function in CI recipients.