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Related Concept Videos

The Cochlea01:13

The Cochlea

47.8K
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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Hair Cells01:22

Hair Cells

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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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Auditory Pathway01:15

Auditory Pathway

6.1K
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...
6.1K
Unrenewable Cells00:50

Unrenewable Cells

2.6K
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...
2.6K
Hearing01:31

Hearing

54.3K
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.
54.3K

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Related Experiment Video

Updated: Oct 23, 2025

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

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Cochlear Synaptopathy: A Primary Factor Affecting Speech Recognition Performance in Presbycusis.

Zhe Chen1, Yanmei Zhang1, Junbo Zhang1

  • 1Department of Otorhinolaryngology Head and Neck Surgery, Peking University First Hospital, Beijing, China.

Biomed Research International
|August 19, 2021
PubMed
Summary

Cochlear synaptopathy, a condition affecting hearing nerve function, is common in elderly individuals with hearing loss. This damage significantly impairs speech recognition, especially in noisy environments.

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Related Experiment Videos

Last Updated: Oct 23, 2025

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Neuro-rehabilitation Approach for Sudden Sensorineural Hearing Loss

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Area of Science:

  • Otolaryngology
  • Neuroscience
  • Audiology

Background:

  • Recent animal studies suggest cochlear synaptopathy plays a role in age-related hearing loss (presbycusis).
  • Cochlear synaptopathy involves damage to the synapses between inner hair cells and auditory nerve fibers.
  • Its prevalence and impact on speech recognition in human presbycusis patients remain unclear.

Purpose of the Study:

  • To investigate the frequency of cochlear synaptopathy in patients diagnosed with presbycusis.
  • To evaluate the effect of cochlear synaptopathy on speech recognition in noisy environments.
  • To correlate electrophysiological findings with audiological performance in elderly individuals.

Main Methods:

  • Ninety-four elderly patients with sensorineural hearing loss underwent audiological examinations.
  • Electrophysiological tests including electrocochleography (ECoG), auditory brainstem responses (ABRs), and auditory cortical evoked potentials were performed.
  • Speech audiometry was used to assess speech recognition in noise, with analysis based on the summating potential/action potential (SP/AP) ratio from ECoG.

Main Results:

  • Abnormal SP/AP ratios, indicative of cochlear synaptopathy, were observed in a significant proportion of presbycusis patients.
  • A reduction in action potential amplitude was noted in ears with abnormal SP/AP ratios.
  • Patients with abnormal SP/AP ratios demonstrated poorer speech recognition in noise, with a higher incidence of signal-to-noise ratio loss.

Conclusions:

  • Cochlear synaptopathy is a frequent finding in elderly individuals experiencing hearing deficits.
  • This condition significantly impacts speech understanding, particularly in challenging auditory environments.
  • Early detection and understanding of cochlear synaptopathy are crucial for managing presbycusis and improving auditory rehabilitation.