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.
See where major scenes from âThe Lord of the Ringsâ and âThe Hobbitâ were filmed during this round-trip Hobbiton Movie Set tour from Rotorua. Youâll visit the North Island sheep farm chosen by director Peter Jackson to depict the Shire, scattered with charming hobbit holes such as the earthen home of Bilbo Baggins.