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Related Concept Videos

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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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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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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Equilibrium and Balance01:15

Equilibrium and Balance

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The inner ear assumes dual functionalities of auditory perception and equilibrium maintenance. The vestibule is the organ responsible for balance. This organ contains mechanoreceptors, specifically hair cells, endowed with stereocilia, which aid in deciphering information regarding the position and motion of our heads. Two intrinsic components, the utricle and saccule, help perceive head position, while the semicircular canals track head movement. Neurological messages initiated in the...
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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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Outer hair cells stir cochlear fluids.

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Related Experiment Video

Updated: Jun 16, 2025

Investigating Outer Hair Cell Motility with a Combination of External Alternating Electrical Field Stimulation and High-speed Image Analysis
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Investigating Outer Hair Cell Motility with a Combination of External Alternating Electrical Field Stimulation and High-speed Image Analysis

Published on: July 18, 2011

13.5K

Outer hair cells stir cochlear fluids.

Choongheon Lee1,2, Mohammad Shokrian2, Kenneth S Henry1,3,4

  • 1Department of Otolaryngology, University of Rochester, Rochester, NY, United States.

Biorxiv : the Preprint Server for Biology
|August 16, 2024
PubMed
Summary
This summary is machine-generated.

Active outer hair cells propel cochlear fluid circulation, aiding drug delivery. This process, crucial for hearing, involves outer hair cell motility and fluid dynamics within the cochlea.

Keywords:
drug deliveryelectromotilitykainic acidorgan of Cortiouter hair cellperilymph

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Area of Science:

  • Otoacoustic emissions
  • Auditory neuroscience
  • Fluid dynamics

Background:

  • Outer hair cells (OHCs) are crucial for hearing sensitivity and frequency selectivity.
  • The precise role of OHCs in cochlear fluid dynamics remains incompletely understood.

Purpose of the Study:

  • To investigate the hypothesis that active outer hair cells drive cochlear fluid circulation.
  • To elucidate the mechanisms by which OHCs influence fluid movement and drug delivery within the cochlea.

Main Methods:

  • In vivo experiments in gerbil cochleae using kainic acid as a tracer.
  • Monitoring auditory responses in the cochlear nucleus to assess drug delivery.
  • Pharmacological manipulation of OHC motility using salicylate.
  • Computational modeling incorporating fluid dynamics, solute diffusion, and fluid-structure interaction.

Main Results:

  • Sound stimulation significantly expedited kainic acid delivery to the cochlea.
  • Salicylate-induced suppression of OHC motility compromised sound-evoked delivery facilitation.
  • Low-frequency tones were more effective than broadband noise for apical drug delivery.
  • Computational models demonstrated OHCs deforming the organ of Corti to generate directional fluid flows.

Conclusions:

  • Active outer hair cells actively drive cochlear fluid circulation, generating apically and basally streaming flows.
  • This OHC-driven circulation plays a significant role in facilitating drug delivery within the cochlea.
  • The findings provide a physical basis for understanding cochlear mechanics and potential therapeutic strategies.