A Gap-fill exercise
neurones have many dendrites. Impulses are conducted from one neurone to another by . In the central nervous system, axons are insulated by myelin sheaths formed by . In the peripheral nervous system, this job is carried out by cells. The is the most common type of supporting cell in the central nervous system. The cell body of a nerve cells is called the . Basophilic stained areas in the cytoplasm of nerve cell bodies are known as bodies. These are accumulations of , sites of active synthesis.The central nervous system is composed of the and spinal cord.