This is a multibranched polysaccharide that serves as a form of energy storage in fungi and animals. Glycogen is created and stored mostly in the cells of the muscles and the liver. It functions as the secondary long-term energy storage. The primary and first energy storage systems are fats held in adipose tissue. Glycogen is known as the analogue of starch since it has a similar structure to amylopectin but it is much more extensively compact and branched than starch. It is found in the form of glucose in the body. Muscle glycogen is converted into glucose by the muscle cells. Liver glycogen converts to glucose for its use throughout the body which includes the central nervous system.