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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.

Hair Cells

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.

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Related Experiment Video

Updated: Apr 23, 2026

Robotic Cochlear Implantation for Direct Cochlear Access

Robotic Cochlear Implantation for Direct Cochlear Access

Published on: June 16, 2022

Cochlear implants.

Olivier Macherey¹, Robert P Carlyon²

¹LMA-CNRS, UPR 7051, Aix-Marseille Univ., Centrale Marseille, 31 Chemin Joseph Aiguier, F-13402 Marseille Cedex 20, France.

Current Biology : CB

|September 24, 2014

Summary

This summary is machine-generated.

Cochlear implants, a neural prosthesis, electrically stimulate the auditory nerve to restore hearing. Over 300,000 individuals have benefited, enabling many to use phones and understand conversations in quiet settings.

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Area of Science:

Biomedical Engineering
Neuroscience
Otolaryngology

Background:

Cochlear implants represent a pioneering neural prosthesis, substituting for a malfunctioning sensory organ.
They function by bypassing the damaged auditory periphery to directly stimulate the auditory nerve with electrical impulses.
The first successful implantation occurred in 1957, marking a significant milestone in auditory restoration.

Purpose of the Study:

To provide a historical overview of cochlear implant development.
To highlight the current clinical status and widespread adoption of cochlear implants.
To discuss the functional outcomes and capabilities of cochlear implant users.

Main Methods:

Historical review of key developments in cochlear implant technology.
Analysis of clinical adoption rates and patient selection criteria evolution.
Summary of functional outcomes reported in the cochlear implant population.

Main Results:

Over 300,000 cochlear implants have been fitted worldwide.
Cochlear implantation is a standard procedure for profoundly deaf children.
Patient selection criteria have broadened, now including individuals with residual hearing.

Conclusions:

Cochlear implants have evolved significantly since their inception.
They are a successful and established treatment for profound deafness.
Many users achieve functional hearing, enabling communication in various settings.