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Related Concept Videos

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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Auditory Pathway01:15

Auditory Pathway

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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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The Cochlea01:13

The Cochlea

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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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Unrenewable Cells00:50

Unrenewable Cells

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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...
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Auditory Perception01:17

Auditory Perception

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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...
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Related Experiment Video

Updated: Mar 25, 2026

Modified Experimental Conditions for Noise-Induced Hearing Loss in Mice and Assessment of Hearing Function and Outer Hair Cell Damage
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Modified Experimental Conditions for Noise-Induced Hearing Loss in Mice and Assessment of Hearing Function and Outer Hair Cell Damage

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Human audiometric thresholds do not predict specific cellular damage in the inner ear.

Lukas D Landegger1, Demetri Psaltis2, Konstantina M Stankovic3

  • 1Eaton Peabody Laboratories, Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, 243 Charles St, Boston, MA 02141, United States; Department of Otolaryngology, Harvard Medical School, 25 Shattuck St, Boston, MA 02115, United States; Department of Otolaryngology, Vienna General Hospital, Medical University of Vienna, Waehringer Guertel 18-20, 1090 Vienna, Austria.

Hearing Research
|March 1, 2016
PubMed
Summary
This summary is machine-generated.

Audiograms do not reliably predict inner ear cellular damage. This study reveals hearing tests are influenced more by hair cell loss than neuron or stria damage, necessitating better diagnostic tools for gene therapy trials.

Keywords:
Audiometric thresholdsCytocochleogramsHair cellsHuman temporal bonesSpiral ganglion neuronsStria vascularis

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Author Spotlight: Advancements in Cultivating Mouse Hair Cells for Auditory Research
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Related Experiment Videos

Last Updated: Mar 25, 2026

Modified Experimental Conditions for Noise-Induced Hearing Loss in Mice and Assessment of Hearing Function and Outer Hair Cell Damage
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Area of Science:

  • Otology
  • Neuroscience
  • Genetics

Background:

  • Audiograms are the standard for hearing evaluation but their ability to predict inner ear cellular damage is unproven.
  • Gene therapy trials in otology require precise patient selection based on cellular damage, a metric current audiograms may not accurately reflect.

Purpose of the Study:

  • To assess the correlation between audiometric thresholds and specific cellular damage (hair cells, neurons, stria) in the human cochlea.
  • To determine if audiograms can serve as reliable inclusion criteria for inner ear gene therapy studies.

Main Methods:

  • Analysis of 131 human temporal bones from individuals with sensorineural hearing loss.
  • Quantification of hair cell, neuron, and strial atrophy using cytocochleograms.
  • Comparison of cytocochleogram data with pre-mortem audiometric thresholds, correlating damage with frequency-specific regions.

Main Results:

  • Audiometric profiles showed significant variability in underlying cellular damage.
  • Audiometric thresholds were more sensitive to hair cell loss than neuronal loss or strial atrophy.
  • Spearman's correlation coefficients between audiometric thresholds and cellular damage were often below 0.5, indicating poor correlation.

Conclusions:

  • Current audiometric thresholds are insufficient predictors of specific cellular damage in the human inner ear.
  • The findings underscore the need for advanced diagnostic tools, like cochlear endoscopy, for accurate cellular-level assessment in otological research and treatment.