<prompt> All of the following statements are true regarding ligamentum denticulatum exceptIt is a modification of arachnoid materThey are 2 in number on each side with 21 triangular processesIt serves as a neurosurgical landmark for AP sectioning of spinal cordIts having a serrated appearance  <response>: Ligamentum denticulatum is not a modification of arachnoid mater. It is a modification of the pia mater. The ligamentum denticulatum is a flat fibrous sheet on either side of the spinal cord present between the ventral and dorsal spinal roots. It serves as a neurosurgical landmark for hemisectioning of the spinal cord. Option C Its medial border is continuous with the subpial connective tissue and lateral border forms a series of 21 triangular processes on each side connecting it to the dura mater giving it a serrated appearance. option B and Option D The lowest of the dentate ligaments lies between the T12 and L1 spinal nerves. Ref: Gray;s Anatomy 41st edition Pgno: 765 