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Related Experiment Videos

Single vs multiple somatic nerve crushes in the rat.

C B Jenq, R E Coggeshall

    Brain Research
    |April 21, 1987
    PubMed
    Summary

    Repeated nerve crushes in rats significantly increase myelinated axon numbers, suggesting potential therapeutic applications for nerve regeneration. This effect is more pronounced with multiple crushes and persists over time.

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    Area of Science:

    • Neuroscience
    • Regenerative Medicine
    • Peripheral Nerve Injury

    Background:

    • Nerve lesions can alter subsequent regenerative capabilities.
    • Understanding these modifications is crucial for developing effective treatments.

    Purpose of the Study:

    • To quantify myelinated and unmyelinated axon numbers after single or multiple sciatic nerve crushes in rats.
    • To investigate the long-term effects of nerve injury on axon regeneration.

    Main Methods:

    • Rats underwent single or triple sciatic nerve crushes.
    • Axon counts were performed in the sciatic nerve and its branches (medial gastrocnemius, sural nerve) at 8 weeks and 9 months post-lesion.

    Main Results:

    • Both single and multiple crushes led to a significant, persistent increase in myelinated axons distal to the lesion site.
    • Multiple crushes resulted in a greater increase in myelinated axons compared to single crushes.
    • A significant increase in myelinated axons was observed between 8 weeks and 9 months after triple crushes, but not single crushes.

    Conclusions:

    • Regenerating myelinated axons may branch at the lesion site and grow into distal nerve branches.
    • Axon branching following nerve injury could be a strategy to enhance neuronal process numbers.
    • The timing of myelination appears to be influenced by the number of nerve crushes.

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