Tubbs R Shane, Murphy Randall Lee, Kelly David R, Lott Robert, Salter E George, Oakes W Jerry
Department of Cell Biology, University of Alabama at Birmingham, Alabama, USA.
J Neurosurg Spine. 2005 Aug;3(2):149-52. doi: 10.3171/spi.2005.3.2.0149.
The filum terminale externum (FTE) is the extradural component of the filum terminale internum and little attention has been dedicated to this structure in the literature. The authors theorized that the rare intrasacral ependymomas may originate from ependymal cell collections within the FTE.
To address this hypothesis, the FTE was dissected and analyzed histologically in 15 adult cadavers. None of the specimens was found to harbor ependymal or other glial cell collections.
The authors found previously undescribed smooth-muscle cells within the FTE. Furthermore, histological analysis identified adipose, nerve, bone, and cartilage cells.
终丝外部（FTE）是终丝内部的硬膜外成分，而文献中对该结构关注较少。作者推测，罕见的骶管内室管膜瘤可能起源于终丝外部内的室管膜细胞聚集体。
为验证这一假说，对15具成年尸体的终丝外部进行了解剖及组织学分析。未发现任何标本含有室管膜或其他神经胶质细胞聚集体。
作者在终丝外部发现了之前未描述过的平滑肌细胞。此外，组织学分析还发现了脂肪、神经、骨和软骨细胞。
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