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Answer to: the myelin sheath that covers many cns axons is formed by
the concentric wrapping of an oligodendrocyte or Schwann cell process around the axon
Myelin is a lipid – rich ( fatty ) substance formed in the central nervous system ( CNS ) by glial cells called oligodendrocytes , and in the peripheral nervous system ( PNS ) by Schwann cells . Myelin insulates nerve cell axons to increase the speed at which information ( encoded as an electrical signal ) travels from one nerve cell body to another ( as in the CNS ) or , for example , from a nerve cell body to a muscle ( as in the PNS ) . The myelinated axon can be likened to an electrical wire ( the axon ) with insulating material ( myelin ) around it . However , unlike the plastic covering on an electrical wire , myelin does not form a single long sheath over the entire length of the axon . Rather , each myelin sheath insulates the axon over a single section and , in general , each axon comprises multiple long myelinated sections separated from each other by short gaps . Each myelin sheath is formed by the concentric wrapping of an oligodendrocyte or Schwann cell process around the axon .
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the myelin sheath that covers many cns axons is formed by
the concentric wrapping of an oligodendrocyte or Schwann cell process around the axon