Our body is up of a lots of cells, cells of the nerve system is called nerve cell or neurons has the job to carry messages through an electrochemical process. A nerve cell is a fibre that sends impulses through the body.These fibres are covered by fatty substance called myelin. Myelin helps the messages go fast through the neurons. The body of a nerve cells from the axon and dendrites is called the soma it holds the nucleus of the cell. The nucleus occupies most of the volume of the soma and is much larger in diameter than the axon and dendrites which are only about a micrometer thick or less. Neurons join to one another and to other cells through synapses.