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.
Starting from Borneo to Micronesia. The next one is Survivor Gabong(or somthing like that):The last eden of earth. It takes place in Africa, and looks to be the most dangerous as there are wild animals like gorillas, hippos, elephants and cheetahs in the sneak peak. This will be the 17th season. Im hoping survivor never ends though as i love it to death. The first season aired in 2000.