Nervous System Review

The nervous system is made of neurons and glial cells. Neurons, with their long axonal processes, electrical excitability, and synaptic connections, play the primary communicating role. Glial cells play a supporting role for both the cell bodies and axons of neurons in the PNS and CNS. The cells of the system are arranged into funtional units that make reception, integration, and response an efficient process. The structural differences between brains of animals reflect the relative importance of particular types of information to that species.