In the central nervous system, there are three different layers that cover the spinal cord and brain. These are called the meninges, and their three levels consist of the: pia, arachnoid, and dura mater. Bone is situated above these layers, followed by periosteum (a fibrous membrane that covers bone) and skin.The dura mater is the top layer of the meninges, lying beneath the bone tissue.This material at times opens into sinus cavities (spaces) located around the skull.he dura mater is the top layer of the meninges, lying beneath the bone tissue. This material at times opens into sinus cavities (spaces) located around the skull.
Planet Earth Making Mountains Planet Earth filmmakers came out in the rugged mountains of Nepal in hopes of filming the elusive snow leopard for the Mountains episode. 01:51.
But more disgusting. Planet Earth crew filmed that dramatic snow leopard hunting scene on the border of Pakistan and Afghanistan when the world was hunting for Al Qaeda. The snow leopard scene is the result of three years' worth of effort by a total of eight crew members and 20 local trackers. t's strange to think how we can now watch the BBC's Planet Earth on Netflix, curled up in our pajamas with all the blankets, cookies and other creature comforts we want.