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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: Jul 23, 2025

Extracting the Cochlea from a Human Temporal Bone: A Cadaveric Protocol

Extracting the Cochlea from a Human Temporal Bone: A Cadaveric Protocol

Published on: August 18, 2023

Variation in cochlear size: A systematic review.

Deven P Curtis¹, Anthony N Baumann¹, Anita Jeyakumar²

¹Northeast Ohio Medical University, USA.

International Journal of Pediatric Otorhinolaryngology

|July 17, 2023

Summary

This summary is machine-generated.

The human cochlea size varies significantly across individuals, with females and sensorineural hearing loss patients exhibiting smaller cochlear duct lengths and "A" values. This study provides normative values for eight cochlear measurements.

Keywords:

Cochlea Cochlea anatomy Cochlea morphology Cochlear implant Cochlear size

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Last Updated: Jul 23, 2025

Extracting the Cochlea from a Human Temporal Bone: A Cadaveric Protocol

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Published on: August 18, 2023

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

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Published on: March 24, 2023

Area of Science:

Anatomy
Audiology
Medical Imaging

Background:

The assumption of uniform human cochlear size is challenged by advancements in imaging and implantation technologies.
Conflicting study results necessitate a comprehensive review of cochlear size variation.

Approach:

Systematic literature search up to October 1, 2022, for studies on human cochlear size.
Included 33 studies encompassing 5,791 cochleae, analyzing eight distinct measurement categories.
Calculated weighted means and ranges for each parameter, considering gender and disease state where possible.

Key Points:

Significant variability observed across eight cochlear parameters.
Normative values and ranges established for each measurement.
Females tend to have smaller cochlear duct length (CDL) and "A" value than males.
Sensorineural hearing loss patients show smaller CDL and "A" value but larger cochlear height compared to the general population.

Conclusions:

The human cochlea exhibits considerable size variation.
Provided normative data for eight key cochlear measurements.
Identified sex-based and disease-state differences in cochlear dimensions, crucial for clinical applications.