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Lumbosacral intersegmental epispinal axons and ectopic ventral nerve rootlets.

W W Parke, R Watanabe

    Journal of Neurosurgery
    |August 1, 1987
    PubMed
    Summary
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    A newly discovered epispinal motor axon system in the human spinal cord may explain a more diffuse efferent distribution than previously understood, impacting motor neuron connectivity. This finding reveals novel intersegmental motor pathways in the conus medullaris.

    Area of Science:

    • Neuroscience
    • Human Anatomy
    • Spinal Cord Research

    Background:

    • The organization of motor axons within the human spinal cord, particularly the conus medullaris, is complex.
    • Previous studies on nerve root interconnections primarily focused on dorsal roots and sensory distribution.

    Purpose of the Study:

    • To investigate the presence and characteristics of an epispinal motor axon system in the human conus medullaris.
    • To determine the origin and destination of these motor axons and their potential role in efferent distribution.

    Main Methods:

    • Microscopic examination of human spinal cord specimens.
    • Tracing of nerve fibers from ventral horn nuclei to spinal nerve roots.
    • Visual identification of ectopic rootlets and their connections.

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    Main Results:

    • An epispinal system of motor axons was identified covering the ventral and lateral funiculi of the conus medullaris (L-2 to S-2).
    • These axons originate from ventral horn motor cells and form ectopic rootlets joining spinal nerve roots inferior to their origin.
    • Occasional rootlets were observed connecting to dorsal nerve roots.

    Conclusions:

    • The identified intersegmental motor fibers suggest a more diffuse efferent distribution than previously suspected.
    • This finding challenges existing models of motor neuron connectivity and segmental organization.
    • Further research is warranted to fully elucidate the functional implications of this epispinal motor system.