A bundle of axons of a nerve neuron , which is part of the peripheral nervous system, through which electrochemical signals are transmitted to the peripheral organs. In the central nervous system , a similar structure is called the neural tract. [1] [2] Neurons are sometimes referred to as nerve cells, but this is not entirely accurate , since many neurons do not form nerves, but nerves contain non -neuron cells, such as swan cells , which enclose axons in myelin. Puts. Each nerve is shaped like a cord , so that there are many axons or nerve fibers . In a nerve, each axon connector is covered by a layer called collar , called endonurium . Finally , all the nerve endings are covered by another layer called the epinurium.