NROB60H3 Chapter Notes - Chapter 7: Dura Mater, Arachnoid Granulation, Pia Mater
Document Summary
12 pairs of cranial nerves that arise from the brain stem and innervate (mostly) the head. Each cranial nerve has a name and a number associated with it. Some are part of the cns, others are part of the somatic pns and others are part of the visceral. Many cranial nerves contain complex mixture of axons that perform differnet functions. The cns (part of nervous system encased in the skull and vertebral column) does not come in direct contact with the overlying bone. Meninges: three membranes collectively that together protect the cns. Dura mater: the outermost covering: dura forms a tough, inelastic bag that surrounds the brain and spinal cord. Arachnoid membrane: just under the dura: has an appearance and consistency of a spider web. Treated by drilling a hole in the skull and draining blood. The brain is essential floating inside the head in in this thin layer of csf.
