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Related Concept Videos

The Cochlea01:13

The Cochlea

41.1K
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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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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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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Hearing01:31

Hearing

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When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.
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Related Experiment Video

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The Miniature Pig: A Large Animal Model for Cochlear Implant Research
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Modelling the generation of the cochlear microphonic.

Mohammad Ayat, Paul D Teal

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |October 11, 2013
    PubMed
    Summary

    A new electromechanical model explains the human ear's cochlear microphonic (CM) signal generation. This model clarifies discrepancies in auditory research, improving our understanding of hearing.

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    Area of Science:

    • Auditory Neuroscience
    • Bioengineering
    • Acoustics

    Background:

    • The cochlear microphonic (CM) is a crucial electrical signal from the human ear, vital for auditory research.
    • Challenges in recording CM and understanding its origins have limited its application in studying human hearing.
    • Advanced modeling offers a pathway to deeper insights into CM generation and function.

    Purpose of the Study:

    • To propose an electromechanical model for generating the cochlear microphonic (CM).
    • To enhance the understanding of CM signal origins and characteristics.
    • To reconcile discrepancies observed between basilar membrane and CM tuning curves.

    Main Methods:

    • Development of a novel electromechanical model simulating CM generation.
    • Analysis of the model's output in response to sound stimuli.
    • Comparison of model-derived tuning curves with experimental basilar membrane and CM data.

    Main Results:

    • The proposed model successfully simulates the generation of the cochlear microphonic.
    • Model results provide explanations for previously observed differences between basilar membrane and CM tuning.
    • The model offers a framework for predicting CM behavior under various auditory conditions.

    Conclusions:

    • The developed electromechanical model is a valuable tool for understanding cochlear microphonic generation.
    • This modeling approach can advance human auditory research by clarifying CM signal properties.
    • The model's ability to explain tuning curve discrepancies highlights its potential for future auditory investigations.