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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...

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.

Auditory Pathway

Auditory Pathway

Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking the...

Auditory Perception

Auditory Perception

The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the cochlea, a...

Hearing

Hearing

When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.

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Related Experiment Video

Updated: May 16, 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

The cochlea as a smart structure.

Stephen J Elliott¹, Christopher A Shera

¹Institute of Sound and Vibration Research, University of Southampton, Tizard Building, Southampton SO17 1BJ, UK.

Smart Materials & Structures

|November 14, 2012

Summary

This summary is machine-generated.

The cochlea

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Area of Science:

Auditory Neuroscience
Bioengineering
Acoustics

Background:

The cochlea, a key component of the inner ear, enables sensitive and selective hearing through its mechanical responses.
It features a coiled tube with fluid chambers separated by a dynamic partition containing outer hair cells.
Outer hair cells act as sensors and actuators, amplifying inner ear motion via local feedback.

Purpose of the Study:

To model the cochlea's mechanical action as a smart structure.
To review a simplified wave model representing essential cochlear dynamics.
To predict cochlear motion in both passive (high sound levels) and active (low sound levels) states.

Main Methods:

Analysis of the cochlea's mechanical response, focusing on wave propagation.
Modeling the interaction between fluid inertia and partition dynamics.
Investigating the role of outer hair cells as motional sensors and actuators.

Main Results:

A dispersive wave propagates along the cochlea due to fluid-partition interactions.
Outer hair cells amplify motion by over 40 dB at low sound pressure levels.
Feedback saturation at high sound pressure levels compresses the dynamic range, enabling a wide auditory response.

Conclusions:

The cochlea functions as an active, nonlinear smart structure.
A simplified wave model can predict cochlear motion across different sound pressure levels.
Understanding cochlear mechanics is crucial for diagnostics like otoacoustic emissions.