What is the ligamentum denticulatum primarily classified as?

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A pair of extensions derived solely from the pia materA structure originating from the dura materAn extension formed only by the arachnoid materA ligament that stretches exclusively to the sacral spinal segmentsNone of the above

Explanation

The ligamentum denticulatum consists of paired extensions that arise exclusively from the pia mater, providing lateral stabilization to the spinal cord. It is not derived from the dura mater or arachnoid mater, nor does it extend solely to the sacral segments.