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Related Concept Videos

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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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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Related Experiment Video

Updated: Dec 21, 2025

Author Spotlight: Advancements in Impedance Monitoring for Cochlear Implant Surgery
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Author Spotlight: Advancements in Impedance Monitoring for Cochlear Implant Surgery

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Implications from cochlear implant insertion for cochlear mechanics.

Michal Kaufmann-Yehezkely1, Ronen Perez2, Haim Sohmer3

  • 1Department of Otorhinolaryngology/Head & Neck Surgery, Hadassah Hebrew University Medical Center, POB 12000, Jerusalem 91120, Israel.

Cochlear Implants International
|May 16, 2020
PubMed
Summary
This summary is machine-generated.

Hearing may not rely on the basilar membrane

Keywords:
Basilar membraneCochlear implantMechanicsResidual hearingTraveling wave

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Area of Science:

  • Auditory Neuroscience
  • Bioacoustics
  • Cochlear Mechanics

Background:

  • The conventional view posits that sound-induced displacements of inner ear windows create pressure differences across the basilar membrane, driving a passive mechanical traveling wave.
  • This wave is traditionally considered the primary mechanism for auditory perception at low sound intensities.

Purpose of the Study:

  • To investigate the role of the passive basilar membrane traveling wave in auditory perception.
  • To explore alternative mechanisms, such as cochlear fluid dynamics, in low-intensity hearing.

Main Methods:

  • Analysis of experimental animal data where fenestrations were created in the inner ear wall.
  • Review of clinical observations from cochlear implantation surgeries regarding auditory thresholds.

Main Results:

  • Opening the cochlea (fenestration) did not result in significant auditory threshold elevations in experimental animals.
  • Patients undergoing cochlear implantation often did not experience elevated thresholds to low-frequency acoustic stimulation despite cochleostomy.

Conclusions:

  • The absence of expected threshold elevations challenges the sole reliance on passive basilar membrane traveling waves for low-intensity hearing.
  • Findings suggest that cochlear fluid pressures and fluid mechanics may play a more critical role in eliciting hearing than previously assumed.