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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: Nov 25, 2025

Cochlear Implant Surgery and Electrically-evoked Auditory Brainstem Response Recordings in C57BL/6 Mice

Cochlear Implant Surgery and Electrically-evoked Auditory Brainstem Response Recordings in C57BL/6 Mice

Published on: January 9, 2019

Changes in electrically evoked auditory brainstem responses in children with sequential bilateral cochlear implants.

Burcu Deniz¹, Eyyup Kara¹, Zahra Polat²

¹İstanbul University-Cerrahpaşa, Faculty of Health Sciences, Department of Audiology, İstanbul, Turkey.

International Journal of Pediatric Otorhinolaryngology

|December 17, 2020

Summary

Electrically evoked auditory brainstem responses (eABR) show differences between first and second cochlear implants (CI1 vs. CI2) in young children. Further study is needed to evaluate long-term interaural differences in cochlear implant performance.

Keywords:

Auditory development Bilateral cochlear implantation Binaural hearing eABR

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Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages

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Published on: March 24, 2023

Area of Science:

Pediatric audiology
Neuroscience
Otolaryngology

Background:

Sequential cochlear implantation (CI) is common in young children with bilateral hearing loss.
Understanding interaural differences in auditory brainstem responses is crucial for optimizing CI outcomes.
Electrically evoked auditory brainstem responses (eABR) provide insights into auditory pathway function.

Purpose of the Study:

To investigate differences in eABR between the first (CI1) and second (CI2) cochlear implants in young children.
To assess changes in eABR parameters over six months post-implantation of the second CI.
To evaluate the relationship between eABR findings and language development.

Main Methods:

Thirteen children under five years old with sequential CIs participated.
Postoperative eABRs were recorded at 1, 3, and 6 months after the second CI fitting.
eABRs were measured for both CIs (CI2 then CI1) at basal, medial, and apical electrode positions.

Main Results:

CI2 showed significantly longer eV wave latencies and lower amplitudes compared to CI1.
Significant changes in eV latency and amplitude were observed over six months, particularly in the medial electrode.
Sound field thresholds and language scores improved significantly in all subjects.

Conclusions:

Postoperative eABR is valuable for assessing CI performance and auditory pathway function.
Six months is insufficient to fully evaluate interaural differences due to ongoing neural maturation.
Longer follow-up is necessary to understand the long-term development of auditory function in sequentially implanted children.