The denticulate ligaments and the filum terminale are both structures that help to anchor the spinal cord and protect it against sudden displacement.

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The denticulate ligaments are lateral extensions of the pia mater that attach to the dura mater and help to anchor the spinal cord within the vertebral column, while the filum terminale is an extension of the pia mater that extends downward from the apex of the conus medullaris to attach to the coccyx, also helping to anchor the spinal cord.

The Denticulate Ligaments and the Filum Terminale Are Both Structures