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Lumbar intrathecal ligaments.

David E Kershner1, Robert T Binhammer

  • 1University of Nebraska Medical Center, Department of Cell Biology and Anatomy, Omaha, Nebraska 68198-6395, USA.

Clinical Anatomy (New York, N.Y.)
|March 6, 2002
PubMed
Summary

Intrathecal ligamentous bands were found in all cadavers, binding the cauda equina nerve roots to the dura. These collagenous structures may be remnants of fetal development.

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Area of Science:

  • Anatomy
  • Histology
  • Neurology

Background:

  • The spinal canal contains the spinal cord and nerve roots within the dural sac.
  • Ligamentous structures within the dural sac are not well-characterized.
  • Understanding these structures is crucial for spinal anatomy and potential pathologies.

Purpose of the Study:

  • To investigate the presence and characteristics of intrathecal ligamentous bands.
  • To determine the composition and potential origin of these observed ligaments.
  • To correlate findings with any observed pathologies.

Main Methods:

  • Examination of 56 adult cadaver vertebral columns (age 64-89).
  • Dissection, radiography, and histological preparations of the cauda equina and lumbar region.
  • Electron microscopy for detailed structural analysis.

Main Results:

  • Discrete intrathecal ligamentous bands were present in all examined cadavers.
  • These bands bound dorsal nerve roots of the cauda equina to the dura.
  • Histology revealed dense collagen bands (0.13-0.35 µm thick, 3 mm-3.5 cm long); average 18 per cadaver.
  • Electron microscopy showed similarities to denticulate ligaments.

Conclusions:

  • Intrathecal ligamentous bands are a common finding in the adult lumbar spine.
  • These ligaments are composed of dense collagen and attach to nerve roots and dura.
  • They are proposed to be remnants of fetal denticulate ligament development.

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