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.
The above opening scenes, first one, was shot at the Janss Conejo Ranch, and the close-ups of the boys were at Chavez Ravine, California. The opening ride-up shots were filmed at Janss Conejo Ranch while filming the pilot episode in April of 1959. The region was urbanized into the community known as Thousand Oaks in 1969. The rugged Santa Susanna Mountains still provide a lovely backdrop, even in today's times.