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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...

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.

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Related Experiment Video

Updated: Jun 18, 2025

Initiating Differentiation in Immortalized Multipotent Otic Progenitor Cells

Initiating Differentiation in Immortalized Multipotent Otic Progenitor Cells

Published on: January 2, 2016

Optogenetically modified human embryonic stem cell-derived otic neurons establish functional synaptic connection with

Yanni Chen^1,2,3,4, Wenbo Mu^1,2,3,4, Yongkang Wu⁵

¹Institute of Translational Medicine, and Children's Hospital Affiliated and Key Laboratory of Diagnosis and Treatment of Neonatal Diseases of Zhejiang Province, The Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou, China.

Journal of Tissue Engineering

|August 2, 2024

Summary

Human embryonic stem cells (hESCs) were converted into otic neurons (ONs) to treat deafness. These stem cell-derived otic neurons (eONs) successfully formed functional connections, offering a potential therapy for spiral ganglia neuron (SGN) impairment.

Keywords:

Auditory circuit neuroregeneration optogenetics organotypic culture otic neurons

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Last Updated: Jun 18, 2025

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Optogenetic Stimulation of the Auditory Nerve

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Published on: October 8, 2014

Culture of Embryonic Mouse Cochlear Explants and Gene Transfer by Electroporation

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Area of Science:

Neuroscience
Stem Cell Biology
Otolaryngology

Background:

Spiral ganglia neuron (SGN) impairment is a significant cause of deafness.
Stem cell therapy is a promising approach for restoring auditory circuits.
Accurate assessment of stem cell-derived neuron functionality is crucial for therapeutic development.

Purpose of the Study:

To develop a novel method for converting human embryonic stem cells (hESCs) into otic neurons (ONs).
To assess the functional connectivity of these derived otic neurons (eONs) within the auditory circuit.
To evaluate the potential of eONs as a therapeutic source for SGN-related deafness.

Main Methods:

Conversion of hESCs into otic neurons (eONs).
Coculture of eONs with rat cochlear nucleus (CN) organotypic slices or cochlear nucleus neurons (CNNs).
Optogenetic stimulation to assess functional synaptic connectivity and neuronal activity.

Main Results:

eONs expressed SGN markers and projected processes into rat CN slices.
Synapsin 1 and VGLUT expression confirmed synaptic integration in the coculture.
Optogenetic stimulation of eONs led to increased action potential spikes and current (I) in CNNs, demonstrating functional synaptic connections.

Conclusions:

Stem cell-derived otic neurons (eONs) can establish functional synaptic connections with cochlear nucleus neurons.
eONs show potential as a therapeutic candidate for treating deafness caused by spiral ganglia neuron impairment.
This study provides a novel method for assessing the functional integration of stem cell-derived neurons in auditory circuits.