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Schwann cells are the supporting cells of the PNS. Like oligodendrocytes schwann cells wrap themselves around nerve axons, but the difference is that a single schwann cell makes up a single segment of an axon's myelin sheath.
In the peripheral nervous system , Schwann cells form a myellin sheath around axons , and in the central nervous system , Oligodendrocâ¦ytes do the same thing for the neurons there ; and Astrocytes ( Astroglia ) surround brain neurons to hold them in place , provide nutrients and oxygen to them , insulate neurons from one another , destroy pathogens ...