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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.

Anatomy of the Ear

Anatomy of the Ear

Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...

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Related Experiment Video

Updated: Jan 18, 2026

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

Cochlear size variation among the Argentinian population.

Maria Fernanda Di Gregorio¹, Ana Celeste Ferrari², Anandhan Dhanasingh³

¹Sanatorio Allende, ENT Department, Otology Unit, Cordoba, Argentina.

Brazilian Journal of Otorhinolaryngology

|September 11, 2025

Summary

This summary is machine-generated.

Cochlear size and shape vary significantly in the Argentine population. This study found Argentine cochleas to be slightly smaller than those reported in other global populations, impacting cochlear implant selection.

Keywords:

Cochlear implant electrode Cochlear shape Cochlear size

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Last Updated: Jan 18, 2026

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

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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

Area of Science:

Otolaryngology
Medical Imaging
Anatomy

Background:

Cochlear anatomy exhibits considerable variation across individuals.
Accurate cochlear dimensions are crucial for selecting appropriate cochlear implant electrode lengths.

Purpose of the Study:

To evaluate variations in cochlear size and shape within the Argentine population.
To provide data for optimizing cochlear implant fitting in this demographic.

Main Methods:

Computed Tomography (CT) scans of 247 ears were analyzed.
Key parameters measured included basal turn diameter (A-value), width (B-value), and height (H-value).
Cochlear Duct Length (CDL) and basal turn shape were also assessed using OTOPLAN® software.

Main Results:

Mean A-value was 8.7 ± 0.61 mm (range 6.7-10.1 mm) and mean B-value was 6.4 ± 0.57 mm (range 4.5-8.1 mm).
Mean cochlear height was 3.78 ± 0.57 mm.
83.5% of cochleas had an elliptical basal turn shape (B/A ratio <0.75), while 16.5% were rounder (B/A ratio ≥0.75).
Cochlear Duct Length (CDL) ranged from 24.5 mm to 41.2 mm, with a median of 33.6 mm.

Conclusions:

The Argentine population exhibits a slightly smaller mean cochlear size compared to other reported populations.
These findings are important for tailoring cochlear implant device selection and surgical planning.