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Related Experiment Videos

Lumbosacral plexus: a histological study

N A Ebraheim1, J Lu, H Yang

  • 1Department of Orthopaedic Surgery, Medical College of Ohio, Toledo 43614, USA.

Acta Anatomica
|January 1, 1997
PubMed
Summary

The lumbosacral trunk (LST) and S1 and L5 nerve roots have the largest cross-sectional areas in the human spine. These roots also show higher epineurial content and fascicle numbers, but less fascicular area percentage.

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Area of Science:

  • Anatomy
  • Histology
  • Neuroscience

Background:

  • The lumbosacral plexus is crucial for lower limb function.
  • Understanding the structural variations in its nerve roots is important for clinical applications.

Purpose of the Study:

  • To quantitatively analyze the cross-sectional areas of spinal nerve roots in the human lumbosacral plexus.
  • To compare the fascicular and epineurial areas across different nerve root levels.

Main Methods:

  • Histological analysis of 240 paraffin-embedded nerve root sections from 20 human lumbosacral plexuses (L4-S3).
  • Digitization of microscopic images using NIH image software.
  • Determination of total, fascicular, and epineurial cross-sectional areas.

Main Results:

Related Experiment Videos

  • The lumbosacral trunk (LST) exhibited the largest total cross-sectional area, followed by S1 and L5 nerve roots.
  • L5, LST, and S1 roots had greater absolute fascicular areas but smaller fascicular area percentages compared to L4, S2, and S3.
  • L5, LST, and S1 roots showed increased epineurial cross-sectional areas and percentages.

Conclusions:

  • The histological structure of lumbosacral nerve roots resembles peripheral nerves.
  • Nerve roots L5, S1, and the LST are characterized by higher epineurial content and fascicle numbers.
  • Despite more fascicles, the fascicular area percentage is lower in L5, S1, and LST compared to L4, S2, and S3 nerve roots.