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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.

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...

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...

Cell Signaling Feedback Loops

Cell Signaling Feedback Loops

Positive and negative feedback loops are crucial for regulating biological signaling systems. These feedback loops are processes that connect output signals to their inputs.
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Output limiter
Upon receiving an input signal, the cellular response rapidly increases until a threshold is reached. Beyond this threshold, a negative feedback loop...

Feedback Regulation of Calcium Concentration

Feedback Regulation of Calcium Concentration

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Various transmembrane receptors, such as G protein-coupled receptors (GPCRs), elicit a response to extracellular signals by increasing cytosolic calcium. Activated GPCRs...

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Related Experiment Video

Updated: Jul 17, 2026

Optogenetic Stimulation of the Auditory Nerve

Optogenetic Stimulation of the Auditory Nerve

Published on: October 8, 2014

Tuning the cochlea: wave-mediated positive feedback between cells.

¹Research School of Biological Sciences, The Australian National University, Canberra, ACT 0200, Australia. andrew.bell@anu.edu.au

Biological Cybernetics

|January 12, 2007

Summary

This study proposes a new model for how the mammalian cochlea (inner ear) analyzes sound. It suggests standing waves between outer hair cells, rather than just travelling waves, explain sharp frequency tuning.

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Last Updated: Jul 17, 2026

Optogenetic Stimulation of the Auditory Nerve

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Dextran Labeling and Uptake in Live and Functional Murine Cochlear Hair Cells

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Published on: February 8, 2020

Postsynaptic Recordings at Afferent Dendrites Contacting Cochlear Inner Hair Cells: Monitoring Multivesicular Release at a Ribbon Synapse

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Published on: February 10, 2011

Area of Science:

Auditory Neuroscience
Bioacoustics
Mechanobiology

Background:

The mammalian cochlea's frequency analysis is traditionally attributed to basilar membrane travelling waves.
A key challenge is explaining the sharp frequency tuning observed in cochlear processing.

Purpose of the Study:

To propose and model an alternative or supplementary mechanism for cochlear frequency analysis.
To investigate the role of standing waves between outer hair cells in sharp tuning.

Main Methods:

Analytical modeling of standing waves between parallel rows of outer hair cells.
Numerical evaluation of a proposed feedback mechanism involving wave-borne energy.
Identification and modeling of a 'squirting wave' for graded phase velocity.

Main Results:

Demonstrated that standing waves between outer hair cells can provide narrow-band frequency analysis.
Showed that graded cochlear tuning can be achieved by varying inter-row distance and wave phase velocity.
Identified resonance between cell rows as a potential source of amplification and high Q, explaining the cochlear amplifier.

Conclusions:

Standing waves between outer hair cells offer a viable mechanism for sharp cochlear frequency tuning.
This model provides a potential explanation for the anatomical basis and operation of the cochlear amplifier.
The proposed mechanism integrates wave mechanics with cellular interactions in the cochlea.