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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...

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.

Unrenewable Cells

Unrenewable Cells

In humans, the photoreceptor cells of the eye and sensory hair cells of the ear lack stem cells. These cells are thus unrenewable and cannot be replaced when they are damaged or destroyed.
Photoreceptors
The retina is composed of several layers and contains specialized cells called photoreceptors. The photoreceptors (rods and cones) change their membrane potential when stimulated by light energy. There are two types of photoreceptors—rods and cones—which differ in the shape of their outer...

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 21, 2026

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

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

Published on: February 10, 2011

The auditory hair cell ribbon synapse: from assembly to function.

Saaid Safieddine¹, Aziz El-Amraoui, Christine Petit

¹Institut Pasteur, Unité de Génétique et Physiologie de l'Audition, F75015, Paris, France. saaid.safieddine@pasteur.fr

Annual Review of Neuroscience

|June 22, 2012

Summary

Cochlear inner hair cells (IHCs) use ribbon synapses to precisely transmit sound information. Recent advances in imaging and genetics reveal new insights into IHC synapse development and function, crucial for speech perception.

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

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Stereocilia Bundle Imaging with Nanoscale Resolution in Live Mammalian Auditory Hair Cells

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Last Updated: May 21, 2026

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

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

Published on: February 10, 2011

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

Stereocilia Bundle Imaging with Nanoscale Resolution in Live Mammalian Auditory Hair Cells

Stereocilia Bundle Imaging with Nanoscale Resolution in Live Mammalian Auditory Hair Cells

Published on: January 21, 2021

Area of Science:

Auditory Neuroscience
Cell Biology
Synaptic Physiology

Background:

Mammalian auditory sensory cells, inner hair cells (IHCs), encode acoustic signals.
Vesicle exocytosis at ribbon synapses is key for transmitting sound information to auditory neurons.
High temporal acuity of IHC synapses is vital for speech perception.

Purpose of the Study:

To review recent knowledge on the physiological and molecular mechanisms of IHC ribbon synapses.
To discuss how new insights illuminate the development and function of these synapses.
To highlight the importance of IHC synapse function in auditory science.

Main Methods:

High-resolution imaging techniques.
Electrophysiological recordings.
Genetic approaches in humans and mice.

Main Results:

Substantial progress has been made in understanding IHC synapse morphology, physiology, and molecular characteristics.
New insights have been gained into the development and function of the IHC ribbon synapse.
The kinetics of glutamate release at IHC synapses are critical for auditory information transfer.

Conclusions:

Recent advancements have significantly improved our understanding of the IHC ribbon synapse.
This knowledge is crucial for understanding auditory processing and speech perception.
Further research will continue to elucidate the complexities of IHC synapse development and function.