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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

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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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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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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

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Rate-dependent cochlear outer hair cell force generation: Models and parameter estimation.

Wen Cai1, Karl Grosh2

  • 1Department of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan.

Biophysical Journal
|August 16, 2024
PubMed
Summary
This summary is machine-generated.

Outer hair cells (OHCs) use prestin to convert electrical to mechanical energy for hearing. This study models prestin

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Area of Science:

  • Auditory Neuroscience
  • Biophysics
  • Mechanobiology

Background:

  • Outer hair cells (OHCs) are crucial for sensitive, frequency-specific hearing in mammals.
  • The membrane protein prestin is hypothesized to mediate OHC electromechanical transduction.
  • Key debates surround prestin's rate-dependent conformational changes and OHC impedance.

Purpose of the Study:

  • To investigate the influence of prestin's rate-dependent conformational changes on OHC function.
  • To develop a theoretical electromechanical model of OHCs incorporating rate dependence and viscoelasticity.
  • To propose experimental methods for determining OHC constitutive properties.

Main Methods:

  • Developed a theoretical electromechanical model of OHCs.
  • The model explicitly includes rate dependence of conformal transitions, viscoelasticity, and piezoelectricity.
  • Proposed whole-cell measurement experiments for property estimation.

Main Results:

  • Demonstrated the impact of rate dependence and viscoelasticity on electromechanical force generation.
  • Showcased the influence of these factors on transmembrane impedance.
  • Highlighted the importance of mechanical boundary conditions for capacitance estimation.

Conclusions:

  • Rate dependence and viscoelasticity significantly affect OHC electromechanical properties.
  • Accurate modeling requires careful consideration of these factors and boundary conditions.
  • Proposed experiments can uniquely determine OHC constitutive properties.