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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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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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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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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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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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Sound as Pressure Waves01:17

Sound as Pressure Waves

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Sound waves, which are longitudinal waves, can be modeled as the displacement amplitude varying as a function of the spatial and temporal coordinates. As a column of the medium is displaced, its successive columns are also displaced. As the successive displacements differ relatively, a pressure difference with the surrounding pressure is created. The gauge pressure varies across the medium.
The pressure fluctuation depends on the difference in displacements between the successive points in the...
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Related Experiment Video

Updated: Apr 27, 2026

The Mouse Round-window Approach for Ototoxic Agent Delivery: A Rapid and Reliable Technique for Inducing Cochlear Cell Degeneration
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The Mouse Round-window Approach for Ototoxic Agent Delivery: A Rapid and Reliable Technique for Inducing Cochlear Cell Degeneration

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Intracochlear pressure changes due to round window opening: a model experiment.

P Mittmann1, A Ernst1, I Todt1

  • 1Department of Otolaryngology, Head and Neck Surgery, Unfallkrankenhaus Berlin, Warenerstraße 7, 12683 Berlin, Germany.

Thescientificworldjournal
|July 2, 2014
PubMed
Summary
This summary is machine-generated.

Preserving hearing during cochlear implantation requires atraumatic electrode insertion. This study found that diode laser opening of the artificial round window membrane minimizes intracochlear pressure changes, crucial for preserving residual hearing.

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Area of Science:

  • Otolaryngology
  • Biomedical Engineering
  • Surgical Innovation

Background:

  • Cochlear implantation aims to preserve residual hearing.
  • Atraumatic insertion of cochlear electrodes is critical.
  • The round window opening technique impacts intracochlear environment.

Purpose of the Study:

  • To investigate intracochlear pressure variations resulting from different artificial round window membrane opening methods.
  • To identify the least invasive method for round window access in cochlear implant surgery.

Main Methods:

  • Experiments conducted using an artificial cochlea model.
  • Artificial round window simulated using polythene foil.
  • Intracochlear pressure monitored via a sensor at the helicotrema area.
  • Various methods used for artificial round window membrane opening: mechanical, needle, CO2 laser, and diode laser.

Main Results:

  • Mechanical opening resulted in biphasic pressure changes.
  • Laser openings (CO2 and diode) produced unidirectional pressure changes.
  • Diode laser opening caused the lowest intracochlear pressure fluctuations.
  • Needle insertion led to the highest pressure changes.
  • CO2 laser opening induced negative pressure and fluid loss.

Conclusions:

  • The method of opening the artificial round window membrane significantly influences intracochlear pressure dynamics.
  • Diode laser appears to be the most atraumatic method for round window access, minimizing pressure changes.
  • Understanding these pressure changes is vital for developing safer cochlear implantation techniques to preserve hearing.