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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: May 30, 2026

Testing a Cochlear Implant Electrode Insertion Training System for Optimal Electrode Array Placement in Different Inner Ear Anatomies

Testing a Cochlear Implant Electrode Insertion Training System for Optimal Electrode Array Placement in Different Inner Ear Anatomies

Published on: February 6, 2026

Cochlear coiling pattern and orientation differences in cochlear implant candidates.

Rodrigo Martinez-Monedero¹, John K Niparko, Nafi Aygun

¹Department of Otolaryngology & Head and Neck Surgery, The Johns Hopkins University, Baltimore, Maryland, USA. rmarti72@jhmi.edu

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology

|August 6, 2011

Summary

Detailed cochlear morphology studies reveal significant dimensional and orientational differences in infants and toddlers. This refined morphometric data aids surgeons in optimizing cochlear implant placement and preserving delicate inner ear structures.

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Enhancing Electrode Location Assessment in Cochlear Implantation via Computed Tomography Image Fusion

Enhancing Electrode Location Assessment in Cochlear Implantation via Computed Tomography Image Fusion

Published on: January 17, 2025

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Last Updated: May 30, 2026

Testing a Cochlear Implant Electrode Insertion Training System for Optimal Electrode Array Placement in Different Inner Ear Anatomies

Testing a Cochlear Implant Electrode Insertion Training System for Optimal Electrode Array Placement in Different Inner Ear Anatomies

Published on: February 6, 2026

Enhancing Electrode Location Assessment in Cochlear Implantation via Computed Tomography Image Fusion

Enhancing Electrode Location Assessment in Cochlear Implantation via Computed Tomography Image Fusion

Published on: January 17, 2025

Area of Science:

Otolaryngology
Neurosurgery
Medical Imaging

Background:

Cochlear morphology studies are crucial for guiding cochleostomy and electrode insertion.
Optimizing neuronal and hair cell preservation is key for successful cochlear implantation.

Purpose of the Study:

To analyze cochlear morphology and orientation in candidates for cochlear implantation.
To compare morphometric data across different age groups, including those with underdeveloped cochleae.

Main Methods:

Morphometric analysis of 124 normal and 7 underdeveloped cochleae using computed tomographic (CT) data.
Measurement of cochlear base length/width, inter-turn angle, and orientation.
3D volume rendering used to assess modiolar inlet in underdeveloped cochleae.

Main Results:

Infants and toddlers (<2 years) showed greater variability in cochlear base dimensions and orientation.
Underdeveloped cochleae exhibited significantly smaller dimensions and altered inter-turn angles compared to normal cochleae.
Modiolar inlet area was significantly smaller in underdeveloped cochleae.

Conclusions:

3D-volume rendering of CT scans reveals key cochlear features not apparent with routine scanning.
Infants and young toddlers present unique cochlear dimensional and orientational variability.
Refined morphometric data can help surgeons tailor implantation strategies for better outcomes and reduced cochlear damage.