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.
Iron Goat: Wellington, WA USA. Ghost towns, lost relics, and abandoned mines. There is a rich history hidden in the landscape. You just have to know where to look. We are here to help. That is why Julie Stonefelt and Kevin Mack started the project Exploring History in your Hiking Boots. Wellington to Tye is located along highway 2 in the Cascade Mountains near Stevens Pass. It was the site of the worst natural disaster in US history when an avalanche in 1910 took 96 lives.