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Fiber composition of the rat sciatic nerve.

H Schmalbruch

    The Anatomical Record
    |May 1, 1986
    PubMed
    Summary

    This study quantifies axon types in the rat sciatic nerve, detailing motor, sensory, and sympathetic axon counts in its major branches. Findings provide a detailed axonal composition of the rat sciatic nerve for anatomical and physiological research.

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    Area of Science:

    • Neuroscience
    • Anatomy
    • Histology

    Background:

    • The rat sciatic nerve is a critical component of the peripheral nervous system.
    • Understanding its axonal composition is essential for studying nerve function and regeneration.

    Purpose of the Study:

    • To precisely determine the number and types of axons within the rat sciatic nerve and its primary branches.
    • To provide a quantitative axonal map of the sciatic nerve for future research.

    Main Methods:

    • Light and electron microscopy were employed to analyze nerve fascicles.
    • Axons were quantified in normal nerves and after experimental manipulations (de-efferentation, sympathectomy).

    Main Results:

    • The tibial nerve contains approximately 1,000 motor, 3,500 myelinated afferent, 3,700 sympathetic, and 5,400 unmyelinated afferent axons.
    • The peroneal nerve comprises roughly 600 motor, 1,300 myelinated afferent, 1,100 sympathetic, and 3,000 unmyelinated afferent axons.
    • The entire sciatic nerve at mid-thigh consists of ~27,000 axons, with specific proportions of myelinated motor, myelinated/unmyelinated sensory, and unmyelinated sympathetic axons.

    Conclusions:

    • The study provides a comprehensive axonal count for the rat sciatic nerve and its branches.
    • This detailed quantitative data serves as a foundational resource for neurobiological studies involving the rat sciatic nerve.

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