Schwann cells attach to neuronal axons and form a layer of electrical insulation, myelin, around large-diameter axons. Or they embed several small axons inside themselves much like a bun wrapped around several hotdogs, to provide structural support for the axonsThere are three types of Schwann cells: nonmyelinating, terminal, and myelinating that form myelin insulation on some axons (all outside the brain and spinal cord). (Fields, R. Douglas, PhD. The Other Brain. p 15, 24, 30. NY: Simon & Schuster, 2009.)

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