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The Schwann Cell is known as a neurilemma cell and sheathe around neuronal axons
are principal gila(cells used to maintain homeostasis) of the peripheral nervous system (PNS)( controlls the nervous system outside of the brain). these cells support neurons and in the PNS

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The Vertebral Nervous system uses the schwann cell as peripheral nervous system analogues  of the central nervous system but unlike the centeral nervous system each schwann cell only insulated one axon. this greatly incrses the speed of conduction and saves energy