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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 26, 2026

Robotic Cochlear Implantation for Direct Cochlear Access

Robotic Cochlear Implantation for Direct Cochlear Access

Published on: June 16, 2022

[Bilateral cochlear implants].

¹Funktionsbereich Otologie und Cochlea Implantate, CI- und Ohrzentrum, Klinik und Poliklinik für Hals‑, Nasen- und Ohrenheilkunde, Campus Großhadern und Campus Innenstadt, Klinikum der Universität München, Marchioninistr. 15, 81377, München, Deutschland. joachim.mueller@med.uni-muenchen.de.

|July 14, 2017

Summary

This summary is machine-generated.

Bilateral cochlear implants (CI) offer superior hearing rehabilitation for severe to profound deafness, enhancing speech understanding and spatial hearing. Bilaterally implanted children show faster developmental progress compared to those with unilateral CI.

Keywords:

Binaural hearing Electric stimulation Hearing Implanted neurostimulators Neural prostheses

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Published on: January 9, 2019

Area of Science:

Audiology
Neurosurgery
Speech-Language Pathology

Background:

Cochlear implants (CI) are a standard treatment for severe to profound deafness.
Bilateral implantation is increasingly recommended for individuals with bilateral hearing loss.
Bilateral CI aims to restore binaural hearing, mimicking natural auditory function.

Purpose of the Study:

To evaluate the benefits of bilateral cochlear implantation compared to unilateral implantation.
To assess the impact of bilateral CI on speech discrimination, spatial hearing, and developmental outcomes in children.
To explore the effects of sequential versus simultaneous bilateral CI fitting.

Main Methods:

Review of current guidelines and clinical recommendations for bilateral CI.
Analysis of speech discrimination, spatial hearing, and developmental milestones in patients with unilateral and bilateral CI.
Comparison of outcomes between simultaneously and sequentially fitted bilateral CI recipients.

Main Results:

Bilateral CI significantly improves speech discrimination in quiet and noise, and restores directional and spatial hearing.
Children with bilateral CI demonstrate faster speech and vocabulary development compared to those with unilateral CI.
Both simultaneous and sequential bilateral CI fitting yield similar benefits, with early fitting being crucial for pediatric outcomes.

Conclusions:

Bilateral cochlear implantation provides significant advantages for hearing rehabilitation, enabling binaural hearing and its associated benefits.
Early and timely bilateral CI fitting, especially in children, is critical for optimizing auditory development and overall outcomes.
Bilateral CI users experience benefits such as the head shadow, squelch, summation, and redundancy effects, comparable to normally hearing individuals.