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Filum Terminale Externum
Nervous System

Filum Terminale Externum

Filum terminale externum

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The filum terminale externum is composed of both pia mater and dura mater and is the terminal portion of the filum terminale. The pia mater that contributes to the filum terminale internum merges with the overlaying spinal dura. It starts within a few centimeters of the coccyx and terminates when the filum terminale externum attaches to the coccyx.

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Key Features/Anatomical Relations

The filum terminale externum is located where the pia and dura mater layers merge, and is approximately 5cm long (Standring, 2016). It is the terminal end of the filum terminale and helps anchor the spinal cord to the coccyx.


Standring, S. (2016) Gray's Anatomy: The Anatomical Basis of Clinical Practice. Gray's Anatomy Series 41 edn.: Elsevier Limited.

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Filum Terminale

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The filum terminale is a strand of connective tissue that extends inferiorly from the conus to the dorsal coccyx.

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