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.
Hell on Earth: Shooting in the Danakil Depression. Hell on earth. It sounds like hyperbole, but the Danakil Depression is exactly that. In late 2013 I spent 1.5 months traveling extensively in Ethiopia, and I visited the Danakil to scout locations for my 'Earth, Wind and Fire' workshop. It is, by my own experience, one of the most inhospitable environments you can actually visit.