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Related Concept Videos

The Cochlea01:13

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 Pathway01:15

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...
Hair Cells01:22

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.
Anatomy of the Ear01:16

Anatomy of the Ear

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...
Auditory Perception01:17

Auditory Perception

The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the cochlea, a...
Hearing01:31

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.

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Related Experiment Video

Updated: Jun 9, 2026

Postsynaptic Recordings at Afferent Dendrites Contacting Cochlear Inner Hair Cells: Monitoring Multivesicular Release at a Ribbon Synapse
11:45

Postsynaptic Recordings at Afferent Dendrites Contacting Cochlear Inner Hair Cells: Monitoring Multivesicular Release at a Ribbon Synapse

Published on: February 10, 2011

Structure and function of cochlear afferent innervation.

Alexander C Meyer1, Tobias Moser

  • 1Department of Otorhinolaryngology, University of Göttingen, Göttingen, Germany. ameyer4@gwdg.de

Current Opinion in Otolaryngology & Head and Neck Surgery
|August 31, 2010
PubMed
Summary
This summary is machine-generated.

Sound perception relies on encoding acoustic signals into neuronal codes at the inner hair cell afferent synapse. Heterogeneity in neuronal responses helps expand the dynamic range of sound intensity that can be processed.

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Postsynaptic Recordings at Afferent Dendrites Contacting Cochlear Inner Hair Cells: Monitoring Multivesicular Release at a Ribbon Synapse
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Published on: February 10, 2011

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Cellular Neuroscience

Background:

  • Acoustic signal perception requires conversion into a neuronal code.
  • This crucial process occurs at the inner hair cells (IHCs) within the organ of Corti and the afferent nerve fibers of the auditory nerve.

Purpose of the Study:

  • To review current knowledge on the anatomy and function of IHCs and auditory nerve fibers.
  • To examine the structure and function of the afferent synapse connecting IHCs to spiral ganglion neurons.

Main Methods:

  • Review of classical studies and recent publications.
  • Analysis of electrophysiological recordings from single auditory nerve fibers.
  • Examination of mechanisms underlying neuronal response heterogeneity.

Main Results:

  • Inner hair cells are innervated by 5-30 dendrites from spiral ganglion neurons, varying by tonotopic location.
  • Auditory nerve fibers exhibit high-frequency selectivity and significant heterogeneity in response to sound intensity.
  • Potential mechanisms for this heterogeneity include presynaptic calcium influx, neurotransmitter release, postsynaptic sensitivity, and fiber variability.

Conclusions:

  • Sound encoding at the IHC afferent synapse involves tonotopic frequency separation.
  • Intensity coding is distributed across multiple neuronal channels.
  • Mechanisms contributing to neuronal heterogeneity may expand the dynamic range of encoded sound.