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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.

Perceiving Loudness, Pitch, and Location

Perceiving Loudness, Pitch, and Location

The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by...

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...

Frequency-dependent Selection

Frequency-dependent Selection

When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.

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Related Experiment Video

Updated: Feb 26, 2026

Morphological and Functional Evaluation of Ribbon Synapses at Specific Frequency Regions of the Mouse Cochlea

Morphological and Functional Evaluation of Ribbon Synapses at Specific Frequency Regions of the Mouse Cochlea

Published on: May 10, 2019

Development of cochlear frequency selectivity tested by compound action potential tuning curves.

E Carlier¹, M Lenoir, R Pujol

¹Laboratoire de Neurophysiologie Sensorielle, Université de Provence, Centre de Saint-Jérôme, 13397 Marseille Cedex 4, France.

Hearing Research

|February 25, 2026

Summary

Cochlear action potential tuning curves in kittens and rat pups show similar maturation. Adult-like frequency selectivity develops alongside outer hair cell receptor maturation.

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Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages

Published on: March 24, 2023

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Last Updated: Feb 26, 2026

Morphological and Functional Evaluation of Ribbon Synapses at Specific Frequency Regions of the Mouse Cochlea

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Published on: May 10, 2019

Behavioral Determination of Stimulus Pair Discrimination of Auditory Acoustic and Electrical Stimuli Using a Classical Conditioning and Heart-rate Approach

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Published on: June 6, 2012

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages

Published on: March 24, 2023

Area of Science:

Auditory Neuroscience
Developmental Biology
Otoacoustic Emissions

Background:

Cochlear frequency selectivity is crucial for hearing.
Understanding its developmental trajectory is key to identifying hearing deficits.
Outer hair cells play a vital role in amplifying auditory signals.

Purpose of the Study:

To investigate the developmental timeline of cochlear frequency selectivity.
To compare the maturation process in different species (kittens and rat pups).
To correlate auditory development with outer hair cell maturation.

Main Methods:

Recording gross cochlear action potential tuning curves in developing kittens and rat pups.
Histological analysis of outer hair cell development stages.
Comparative analysis of tuning curve sharpness and receptor development.

Main Results:

Cochlear tuning properties matured similarly in both kittens and rat pups.
The development of sharp, adult-like tuning curves aligned with the final stages of outer hair cell receptor development.
This suggests a direct link between outer hair cell maturation and auditory frequency resolution.

Conclusions:

The maturation of cochlear frequency selectivity follows a conserved developmental path in mammals.
Outer hair cell development is a critical determinant for achieving adult-like auditory tuning.
These findings provide insights into the developmental basis of hearing.