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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.

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.

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...

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Related Experiment Video

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

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Cochlear nucleus neuron analysis in individuals with presbycusis.

Raul Hinojosa¹, Erik G Nelson

¹Section of Otolaryngology-Head and Neck Surgery, Department of Surgery, University of Chicago, Chicago, Illinois 60637-1447, USA.

The Laryngoscope

|November 24, 2011

Summary

Presbycusis, or age-related hearing loss, is linked to a higher cochlear nucleus neuron population, not just aging. This study quantifies neuron types in normal hearing and presbycusis groups, revealing distinct differences.

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Area of Science:

Neuroscience
Auditory Neuroscience
Otolaryngology

Background:

Presbycusis is a common form of age-related hearing loss.
The underlying neural changes in the cochlear nucleus are not fully understood.

Purpose of the Study:

To quantify and compare the cochlear nucleus neuron populations in normal hearing individuals and those with presbycusis.
To investigate potential differences in neuron types and cell body size.

Main Methods:

Retrospective analysis of human temporal bone and brain stem tissues.
Quantification of spiral ganglion cells and cochlear nucleus neurons in normal hearing (n=6) and presbycusis (n=4) groups.
Analysis of neuron cell body size.

Main Results:

Presbycusis subjects showed a reduced spiral ganglion cell population.
The cochlear nucleus neuron population was significantly higher in the presbycusis group (114,170 ± 10,570) versus normal hearing (91,470 ± 9,510).
Increased multipolar and granule cell populations, and larger fusiform neuron cell bodies were observed in presbycusis.

Conclusions:

Presbycusis may involve a congenitally elevated cochlear nucleus neuron population, suggesting it's more than just an aging effect.
This is the first study to quantify all eight neuron types in the cochlear nucleus for both normal hearing and presbycusis.
Findings support presbycusis as a condition predisposing to hearing loss with age, characterized by specific neural population differences.