types of cells within the nervous system
2. peripheral nervous system (PNS) - nerves extending toward or away from CNS and ganglia (aggregations of nerve cell bodies outside CNS). Nervous tissue consists of two major types of cells, 1. neurons-responsible for conduction, propagation, and reception of nervous impulses. Processes called axons or dendrites extend from these cells. 2. glial cells - (neuroglia) cells associated with neurons. No axons or dendrites. These cells are involved in nutrition, support, insulation, protection of neurons. If brain or spinal cord are sectioned, we find that two major areas of brain tissue may be defined on the basis of their color in fixed, unstained tissue.