Spinal pia mater软脊膜 a delicate vascular membrane that closely invests the spinal cord Denticulate ligament齿状韧带 consist of 21 pairs triangular ligaments extending from spinal cord on each side between anterior and posterior roots of spinal nerves to spinal dura mate; these ligaments help to fix position of spinal cord filum terminale: an extension of pia beyond conus medullarisSpinal pia mater 软脊膜 ◼ A delicate vascular membrane that closely invests the spinal cord ◼ Denticulate ligament齿状韧带: consist of 21 pairs triangular ligaments extending from spinal cord on each side between anterior and posterior roots of spinal nerves to spinal dura mate; these ligaments help to fix position of spinal cord. ◼ Filum terminale: an extension of pia beyond conus medullaris