Another example of a synthesis reaction is the formation of sodium chloride (table salt). Because of the very high reactivities of sodium metal and chlorine gas, this reaction releases a tremendous amount of heat and light energy.
Schwann cells make myelin in the peripheral nervous system (PNS: nerves) and oligodendrocytes in the central nervous system (CNS: brain and spinal cord). In the PNS, one Schwann cell forms a single myelin sheath (Figure 1A).
Neuroglial Cells fill spaces, support neurons, provide structural frameworks, produce myelin, and carry on phagocytosis. Four are found in the CNS and the last in the PNS. Microglial cells are small cells that phagocytize bacterial cells and cellular debris. Oligodendrocyte form myelin in the brain and spinal cord.