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Related Experiment Videos

Cupula-receptor cell relationships with evidence provided by SEM microdissection.

V C Barber, C J Emerson

    Scanning Electron Microscopy
    |January 1, 1979
    PubMed
    Summary

    Sensory hair cells in skate inner ear ampullae connect to the cupula. Displacing the cupula causes these hair bundles to break at their base from receptor cells.

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    Area of Science:

    • Otolaryngology
    • Neuroscience
    • Marine Biology

    Background:

    • The inner ear's ampullae contain sensory receptor cells crucial for balance.
    • The cupula, a gelatinous structure, overlies these sensory cells and is key to detecting motion.

    Purpose of the Study:

    • To clarify the relationship between sensory hairs of inner ear receptor cells and the overlying cupula in the skate (Raja ocellata).
    • To visualize the attachment and behavior of sensory hairs during cupular displacement.

    Main Methods:

    • Scanning electron microscopy (SEM) was used to examine skate inner ear ampullae.
    • Specimens underwent various preparation methods, including critical point drying and freeze-drying.
    • In-situ microdissection within the SEM allowed real-time observation of cupular displacement.

    Main Results:

    • Freeze-drying preserved cupular structure better than critical point drying.
    • Sensory hair bundles and kinocilia of receptor cells were observed extending to and contacting the cupular material.
    • Microdissection confirmed kinocilia attachment to the cupula, with hair bundles breaking at their base upon displacement.

    Conclusions:

    • Sensory hairs of skate inner ear receptor cells are attached to the cupula.
    • Mechanical stress during cupular displacement leads to preferential breakage at the base of the sensory hair bundles.

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