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Related Experiment Videos

Sprouting in the avian brainstem auditory pathway: dependence on dendritic integrity

E W Rubel, Z D Smith, O Steward

    The Journal of Comparative Neurology
    |November 1, 1981
    PubMed
    Summary

    In chickens, denervated dendrites in the auditory pathway do not disappear but are reinnervated by neighboring neurons. This demonstrates neural plasticity and the potential for functional recovery after injury.

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    Rapid regulation of microtubule-associated protein 2 in dendrites of nucleus laminaris of the chick following deprivation of afferent activity.

    Neuroscience·2008

    Area of Science:

    • Neuroscience
    • Auditory System Research
    • Neural Plasticity

    Background:

    • The chicken brainstem auditory pathway features third-order neurons (n. laminaris) receiving binaural input from n. magnocellularis.
    • Ipsilateral afferents target dorsal dendrites, while contralateral afferents innervate ventral dendrites.

    Purpose of the Study:

    • To investigate dendrite maintenance after denervation and reinnervation by surviving afferents.
    • To understand the plasticity of the auditory pathway in response to injury.

    Main Methods:

    • Transection of the crossed dorsal cochlear tract to denervate ventral dendrites.
    • Unilateral cochlea removal to induce partial denervation of n. laminaris cells.
    • Degeneration methods to trace neuronal projections and assess reinnervation.

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    Main Results:

    • Denervation of ventral dendrites leads to rapid atrophy.
    • Partial denervation of n. laminaris dendrites does not cause them to disappear.
    • Denervated dendrites are reinnervated by afferents from the contralateral n. magnocellularis.

    Conclusions:

    • Auditory pathway dendrites exhibit plasticity, resisting atrophy after partial denervation.
    • Cross-innervation by surviving afferents occurs, suggesting a mechanism for functional compensation.