The nervous system of humans and other animals is a vital part of how the body functions. Components of the nervous system including neurons, glial cells and axon all help send nerve signals around the body. Read on to find out about the two main parts of our body's nervous system and many other interesting facts.The nervous system is a complex structure of nerves of neurons that transmit signals around the body to coordinate actions.It is in effect our body's electrical wiring.omponents of the nervous system including neurons, glial cells and axon all help send nerve signals around the body. Read on to find out about the two main parts of our body's nervous system and many other interesting facts.