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The filum terminale externum.

R Shane Tubbs1, Randall Lee Murphy, David R Kelly

  • 1Department of Cell Biology, University of Alabama at Birmingham, Alabama, USA. rstubbs@uab.edu

Journal of Neurosurgery. Spine
|December 24, 2005
PubMed
Summary
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Researchers investigated the filum terminale externum (FTE), theorizing it might harbor cells for rare tumors. Histological analysis revealed smooth-muscle cells, not ependymal cells, within the FTE.

Area of Science:

  • Anatomy
  • Histology
  • Neurosurgery

Background:

  • The filum terminale externum (FTE), an extradural structure, is poorly understood.
  • Ependymomas are rare tumors that occur within the sacrum.

Purpose of the Study:

  • To investigate the histological composition of the filum terminale externum (FTE).
  • To test the hypothesis that ependymal cell collections within the FTE may be the origin of intrasacral ependymomas.

Main Methods:

  • The FTE was dissected from 15 adult cadavers.
  • Histological analysis was performed on the dissected FTE specimens.

Main Results:

  • No ependymal or glial cell collections were identified within the FTE.
  • Previously undescribed smooth-muscle cells were found within the FTE.

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  • Adipose, nerve, bone, and cartilage cells were also identified in the FTE.

    • Conclusions:

    • The FTE does not appear to contain ependymal cell collections.
    • The FTE contains smooth-muscle cells, adipose tissue, nerves, bone, and cartilage.
    • The origin of intrasacral ependymomas remains unclear based on this study.