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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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Updated: Dec 30, 2025

The Mouse Round-window Approach for Ototoxic Agent Delivery: A Rapid and Reliable Technique for Inducing Cochlear Cell Degeneration
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Cochlear dysfunction is associated with styrene exposure in humans.

Mariola Sliwinska-Kowalska1, Adrian Fuente2,3, Ewa Zamyslowska-Szmytke1

  • 1Department of Audiology and Phoniatrics, Nofer Institute of Occupational Medicine, Lodz, Poland.

Plos One
|January 22, 2020
PubMed
Summary
This summary is machine-generated.

Occupational styrene exposure may harm hearing, specifically affecting the cochlea. This study found styrene linked to hearing function changes, suggesting cochlear dysfunction in exposed workers.

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Area of Science:

  • Occupational health
  • Auditory science
  • Toxicology

Background:

  • Occupational styrene exposure is linked to hearing loss.
  • The specific auditory system sites affected by styrene remain unclear.
  • Understanding styrene's impact on the cochlea is crucial for worker health.

Purpose of the Study:

  • To investigate the adverse effects of occupational styrene exposure on the human cochlea.
  • To evaluate hearing function in styrene-exposed workers.

Main Methods:

  • Pure-tone audiometry (1000-16000 Hz), distortion product otoacoustic emissions (DPOAEs), and auditory brainstem response (ABR) were used.
  • Hearing was assessed in 98 styrene-exposed workers, compared to noise-exposed and unexposed control groups.
  • Age and noise exposure were controlled for in statistical analyses.

Main Results:

  • Styrene exposure correlated with poorer hearing thresholds (1-8 kHz) and reduced DPOAE amplitudes (5-6 kHz).
  • Auditory brainstem response showed shorter wave V latencies in styrene-exposed subjects, indicating cochlear dysfunction.
  • These effects were observed bilaterally and suggest cochlear involvement at high frequencies.

Conclusions:

  • Occupational styrene exposure, even at moderate levels, is associated with cochlear dysfunction.
  • Distortion product otoacoustic emissions (DPOAEs) are valuable for monitoring hearing in styrene-exposed workers.
  • Early detection of cochlear changes can aid in hearing conservation programs.