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Related Experiment Videos

The human lumbar dorsal rami

N Bogduk, A S Wilson, W Tynan

    Journal of Anatomy
    |March 1, 1982
    PubMed
    Summary

    This study details the branching patterns of lumbar dorsal rami and their innervations. Understanding this anatomy is crucial for procedures like facet denervation and diagnostic electromyography.

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    Area of Science:

    • Anatomy
    • Neuroscience
    • Surgical Anatomy

    Background:

    • The dorsal rami of lumbar nerves (L 1-4) typically bifurcate into medial, lateral, and intermediate branches.
    • These branches supply specific deep back muscles and zygapophysial joints.
    • Variations exist, particularly at L 1-3, and the L 5 dorsal ramus has a distinct branching pattern.

    Purpose of the Study:

    • To describe the detailed anatomy of the lumbar dorsal rami.
    • To elucidate the innervation patterns of deep back muscles and zygapophysial joints.
    • To discuss the clinical relevance of this anatomy in pain management and diagnostic procedures.

    Main Methods:

    • Detailed anatomical dissection and observation of lumbar dorsal rami.
    • Comparative analysis of branching patterns across different lumbar levels.
    • Review of applied anatomical concepts in clinical practice.

    Main Results:

    • L 1-4 dorsal rami generally form medial, lateral, and intermediate branches supplying multifidus, iliocostalis, and longissimus, respectively.
    • The L 5 dorsal ramus exhibits a unique pattern with only medial and intermediate branches.
    • Each medial branch innervates two adjacent zygapophysial joints and specific fascicles of the multifidus muscle.

    Conclusions:

    • The described anatomy of lumbar dorsal rami is fundamental for understanding spinal innervation.
    • Knowledge of these branching patterns is essential for targeted interventions such as rhizolysis and facet denervation.
    • Accurate anatomical understanding supports the effective use of diagnostic paraspinal electromyography.

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