(
) Nervous system is body’s internal electrochemicals and communication network. Its main parts are the brain, spinal cord and nerves.The brain and spinal cord from the central nervous system CNS, the body’s chief controlling and coordinating centres. Billions of long neurons.d many grouped as nerves make up the perapheral nervous system ,Transmitting nerve impulse between the between the CNS and the other Reasons of the body Each neuron has three parts a cell body ,branching dendrites that receive chemical signals from other nervourons, and a tube- likes axon that conveys these signals at electrical Impulses. 
