in Neural Control and Coordination (Nervous System) by

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  1. In our nervous system many axons are covered by a protective myelin sheath.
  2. Myelin sheath is a white layer of fatty material; derived from the membrane of Schwann cells; surrounds certain nerve fibers and acts as an electrical insulator
  3. In the nervous system the bundles of parallel axons of the nervous tissue having myelin sheath constitute the white matter.
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