Abstract
Objective To explore the pathogenesis of filum terminale externum ependymoma,the ultrastructure of filum terminale externum will be studied on.Method Ten fila from normal fetuses were removed,the transverse and longitudinal sections were respectively submitted for light and electron microscopy analysis.Results Filum terminale externum from normal fetuses mainly composed of fibrous tissue,calcification and ganglion cells.No ependymal cells were found.Conclusions There is no ependymal cell within filum terminale;sacral ependymoma probably originated in ectopic ependymal cells. Key words: Filum terminale; Ependymoma; Structure
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