Expected headings
"Denticulate ligaments"
"Filum terminale"
"The pia has numerous outward projections, the denticulate ligaments, that pierce through the arachnoid mater and attach to the outer dural layer 3. These have the function of suspending the spinal cord relatively centrally within the spinal canal, which is particularly important during movement of the vertebral column. There are 21 pairs of triangular-shaped outward projections that extend laterally from the pia, with their apices attaching to the outer dura 2. They are referred to as the denticulate ligaments of the spinal cord due to their teeth-like appearance 3."