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Related Concept Videos

The Cochlea01:13

The Cochlea

52.7K
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.
52.7K
Auditory Pathway01:15

Auditory Pathway

9.1K
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...
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Anatomy of the Ear01:16

Anatomy of the Ear

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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...
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Hair Cells01:22

Hair Cells

46.8K
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.
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Related Experiment Video

Updated: Apr 15, 2026

Cochlear Surface Preparation in the Adult Mouse
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Cochlear Surface Preparation in the Adult Mouse

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Cochlear efferents in developing adult and pathological conditions.

Régis Nouvian1, Michel Eybalin, Jean-Luc Puel

  • 1Inserm U1051 - Institute for Neurosciences of Montpellier, 34091, Montpellier cedex 5, France, regis.nouvian@inserm.fr.

Cell and Tissue Research
|March 27, 2015
PubMed
Summary

The brainstem

Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Oto-neurology

Background:

  • The olivo-cochlear bundle, originating from the brainstem, regulates cochlear activity by projecting to hair cells and auditory nerve fibers.
  • Two efferent components, medial and lateral olivo-cochlear efferents, arise from the superior olivary complex.
  • Efferent input to hair cells is crucial during development and persists in adult cochleas.

Purpose of the Study:

  • To review the mechanisms of efferent control over hair cell and auditory nerve fiber excitability.
  • To discuss the role of efferent innervations in cochlear development, adult function, and pathological conditions.
  • To highlight the plasticity of efferent innervations in response to noise trauma and aging.

Main Methods:

  • This review synthesizes findings from recent studies on efferent neural pathways in the cochlea.

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Whole Mount Dissection and Immunofluorescence of the Adult Mouse Cochlea
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Whole Mount Dissection and Immunofluorescence of the Adult Mouse Cochlea

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Evaluation of Planar-Cell-Polarity Phenotypes in Ciliopathy Mouse Mutant Cochlea
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Evaluation of Planar-Cell-Polarity Phenotypes in Ciliopathy Mouse Mutant Cochlea

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Related Experiment Videos

Last Updated: Apr 15, 2026

Cochlear Surface Preparation in the Adult Mouse
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Cochlear Surface Preparation in the Adult Mouse

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Whole Mount Dissection and Immunofluorescence of the Adult Mouse Cochlea
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Whole Mount Dissection and Immunofluorescence of the Adult Mouse Cochlea

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Evaluation of Planar-Cell-Polarity Phenotypes in Ciliopathy Mouse Mutant Cochlea
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  • It examines the functional roles of medial and lateral olivo-cochlear systems.
  • The discussion includes developmental, adult, and pathological contexts.

    • Main Results:

    • Efferent innervations are essential for establishing activity patterns in developing hair cells and auditory nerve fibers.
    • These innervations protect synaptic structures in the adult cochlea.
    • Efferent systems exhibit plasticity under conditions like noise trauma and aging.

    Conclusions:

    • Efferent neurons play a critical role in modulating cochlear activity and protecting auditory structures.
    • Understanding efferent mechanisms is key to addressing hearing impairments related to development, aging, and noise exposure.
    • The plasticity of efferent innervations offers potential therapeutic targets for auditory disorders.