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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.

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.

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...

Ligand-Gated Ion Channel Receptor: Gating Mechanism

Ligand-Gated Ion Channel Receptor: Gating Mechanism

Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...

Mechanically-gated Ion Channels

Mechanically-gated Ion Channels

Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...

Voltage-gated Ion Channels

Voltage-gated Ion Channels

Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several types of...

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Related Experiment Video

Updated: May 26, 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

Cochlear kainate receptors.

Marcello Peppi¹, Melissa Landa¹, William F Sewell²

¹Department of Otology and Laryngology, Eaton Peabody Laboratory, Massachusetts Eye and Ear Infirmary and Harvard Medical School, 243 Charles Street, Boston, MA, 02114, USA.

Journal of the Association for Research in Otolaryngology : JARO

|January 11, 2012

Summary

Kainate receptors, alongside AMPA receptors, are present at the auditory nerve synapse. Blocking kainate receptors impairs auditory nerve function, suggesting their role in hearing.

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Area of Science:

Neuroscience
Auditory Neuroscience
Molecular Biology

Background:

Synaptic transmission in the cochlea relies on glutamate receptors.
The specific role and distribution of kainate receptors in the auditory system remain unclear.

Purpose of the Study:

To investigate the presence, distribution, and function of kainate receptors at the hair cell afferent synapse.
To determine the contribution of kainate receptors to auditory neurotransmission.

Main Methods:

Quantitative RT-PCR and immunohistochemistry to detect kainate receptor subunits in the mouse cochlea.
Pharmacological blockade of GluK1 kainate receptors using UBP296.
Measurement of compound action potentials and otoacoustic emissions.

Main Results:

All five kainate receptor subunits were detected in the mouse cochlea.
Kainate receptors were found co-localized with AMPA receptors at afferent terminals.
Pharmacological inhibition of kainate receptors reduced auditory nerve responses and elevated neural thresholds.

Conclusions:

Kainate receptors are present at the auditory nerve synapse and likely contribute to synaptic transmission.
Auditory neurotransmission may involve a combination of AMPA and kainate receptors.