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.
There and in the Planet Earth scene, the heroes witness the effect of their own violence on children, forcing them to rethink the use of forceâa very effective and intelligent pacifistic touch from Roddenberry. This article is about the science fiction film. For the BBC documentary, see Planet Earth (TV series) .Planet Earth is a science fiction television movie that was created by Gene Roddenberry, written by Roddenberry and Juanita Bartlett (from a story by Roddenberry).It first aired on April 23, 1974 on the ABC network, and stars John Saxon as Dylan Hunt.here and in the Planet Earth scene, the heroes witness the effect of their own violence on children, forcing them to rethink the use of forceâa very effective and intelligent pacifistic touch from Roddenberry. This article is about the science fiction film. For the BBC documentary, see Planet Earth (TV series) .