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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...

Equilibrium and Balance

Equilibrium and Balance

The inner ear assumes dual functionalities of auditory perception and equilibrium maintenance. The vestibule is the organ responsible for balance. This organ contains mechanoreceptors, specifically hair cells, endowed with stereocilia, which aid in deciphering information regarding the position and motion of our heads. Two intrinsic components, the utricle and saccule, help perceive head position, while the semicircular canals track head movement. Neurological messages initiated in the...

Accessory Structures of the Skin: Hair and Hair Follicles

Accessory Structures of the Skin: Hair and Hair Follicles

Hair and hair follicles are integral components of the integumentary system. Hair is a filamentous structure composed mainly of a protein called keratin. It is found on the surface of the skin throughout the body, except for areas such as the palms of the hands and soles of the feet.
Hair is a keratinous filament growing out of the epidermis. It is primarily made of dead, keratinized cells. Hair strands originate at the epidermal penetration called the hair follicle. The hair shaft is the part...

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...

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Related Experiment Video

Updated: May 22, 2026

Physiological Preparation of Hair Cells from the Sacculus of the American Bullfrog (Rana catesbeiana)

Physiological Preparation of Hair Cells from the Sacculus of the American Bullfrog (Rana catesbeiana)

Published on: March 17, 2017

Efferent modulation of hair cell function.

Richard D Rabbitt¹, William E Brownell

¹Department of Bioengineering, University of Utah, Salt Lake City, Utah, USA.

Current Opinion in Otolaryngology & Head and Neck Surgery

|May 4, 2012

Summary

This summary is machine-generated.

Inner-ear efferents modulate hair cell function, impacting auditory processing and sound localization. New research offers insights into the cochlear amplifier and potential clinical tests for the auditory and vestibular systems.

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Related Experiment Videos

Last Updated: May 22, 2026

Physiological Preparation of Hair Cells from the Sacculus of the American Bullfrog (Rana catesbeiana)

Physiological Preparation of Hair Cells from the Sacculus of the American Bullfrog (Rana catesbeiana)

Published on: March 17, 2017

Dextran Labeling and Uptake in Live and Functional Murine Cochlear Hair Cells

Dextran Labeling and Uptake in Live and Functional Murine Cochlear Hair Cells

Published on: February 8, 2020

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

Area of Science:

Neuroscience
Auditory Neuroscience
Oto-neurology

Background:

Inner-ear efferents play a crucial role in modulating sensory hair cell function.
Understanding these efferent pathways is key to comprehending auditory processing and plasticity.

Purpose of the Study:

To review recent findings (2010-2011) on inner-ear efferents and their modulation of hair cell function.
To explore efferent contributions to auditory processing, sound localization, and potential clinical applications.

Main Methods:

Literature review of articles published between 2010 and early 2011.
Analysis of studies investigating efferent mechanisms in cochlear and vestibular systems.
Examination of animal and human studies on olivocochlear efferents and sound localization.

Main Results:

Efferent pathways regulate hair cell sensitivity and auditory nerve transmission.
Olivocochlear efferents significantly contribute to sound localization, especially in noisy environments.
Insights gained into the cochlear amplifier's function and limitations.

Conclusions:

Acoustic activation of olivocochlear fibers serves as a clinical test for auditory system integrity.
Potential exists for developing similar clinical tests for the efferent vestibular system.
Further research may enable reliable testing of vestibular hair cell function.