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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: Feb 25, 2026

Investigating Outer Hair Cell Motility with a Combination of External Alternating Electrical Field Stimulation and High-speed Image Analysis

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Published on: July 18, 2011

Simulating the Chan-Hudspeth experiment on an active excised cochlear segment.

Amir Nankali¹, Karl Grosh²

¹Department of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA.

The Journal of the Acoustical Society of America

|August 3, 2017

Summary

This summary is machine-generated.

A new computational model simplifies cochlear mechanics, revealing that fluid loading insignificantly impacts sound processing dynamics. This model aids in understanding the organ of Corti

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Last Updated: Feb 25, 2026

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Published on: February 10, 2011

Area of Science:

Auditory Neuroscience
Biophysics
Computational Biology

Background:

Hearing involves complex coupled interactions within the cochlea.
The organ of Corti (OoC) and basilar membrane properties influence cochlear function.
Investigating active processes in vivo is challenging.

Purpose of the Study:

Develop a quasilinear computational model for the active in vitro response of the OoC.
Analyze acoustical stimulation effects on excised cochlear segments.
Simplify cochlear fluid dynamics for computational efficiency.

Main Methods:

Utilized an excised cochlear segment experiment as a model problem.
Developed a quasilinear computational model simulating electrical, mechanical, and acoustical conditions.
Reduced 3D fluid dynamics to an added mass loading on the OoC.

Main Results:

The model replicated experimental results, including sensory epithelium frequency response and resonance frequency variations.
A phase accumulation was predicted along the cochlear segment, similar to experimental findings.
The contribution of phase accumulation to cochlear dynamics was found to be insignificant.

Conclusions:

The simplified computational model effectively simulates active cochlear responses.
Fluid loading's dynamic contribution is minimal, allowing for model simplification.
This approach facilitates further study of the organ of Corti's active processes.