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Filum Terminale Internum
Nervous System

Filum Terminale Internum

Filum terminale internum

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The filum terminale internum is the superior portion of the filum terminale that runs from the conus medullaris, inferiorly, to the filum terminale externum. The filum terminale internum forms the majority of the length of the filum terminale and is generally the portion seen in cadaveric specimens. The filum terminale internum is composed of pia mater. In cadaveric specimens, it often is distinguishable from spinal nerve roots due to its silvery to opaque appearance.

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Key Features/Anatomical Relations

When the spinal cord terminates at roughly the L1-L2 vertebral level in adults, the overlaying pia mater continues down, forming a collapsed tube of pia mater. Together with denticulate ligaments, the filum terminale internum can be seen with the naked eye.

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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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