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Cell clusters on rat ventral roots: postnatal development.

J P Fraher, J P Rossiter

    Journal of Anatomy
    |October 1, 1983
    PubMed
    Summary

    Cell clusters on rat ventral spinal nerve rootlets form a matrix around axons during development. This matrix disappears, and Schwann cells myelinate axons, reversing the typical maturation gradient.

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    Area of Science:

    • Neuroscience
    • Developmental Biology
    • Cell Biology

    Background:

    • Cell clusters are present on rat ventral spinal nerve rootlets during prenatal development.
    • These clusters persist into the postnatal period and gradually decrease in size.

    Purpose of the Study:

    • To investigate the role and fate of cell clusters on rat ventral spinal nerve rootlets during development.
    • To understand the process of axon myelination by Schwann cells in the proximal ventral root.

    Main Methods:

    • Observation of cell clusters and axon development in rat ventral spinal nerve rootlets.
    • Analysis of Schwann cell behavior and myelination patterns during prenatal and postnatal periods.

    Main Results:

    • Cell clusters initially form a matrix around axons, which disappears post-birth.
    • Premyelin Schwann cells from clusters envelop unmyelinated axons, leading to a proximodistal maturation reversal.
    • Myelination proceeds distally, with proximal internodes initially unmyelinated while distal ones are myelinated.

    Conclusions:

    • The development of rat ventral spinal nerve rootlets involves a unique myelination process initiated by cell clusters.
    • A temporary reversal of the proximodistal maturation gradient occurs due to Schwann cell envelopment of proximal axons.
    • This developmental pattern may be transient, with potential for elongation and increased myelination of short internodes.

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