• The nervous system is a complex network of nervous tissue that carries electrical messages throughout the body.
  • Neurons are the structural and functional units of the nervous system.
  • They transmit electrical signals, called nerve impulses.
  • Glial cells provide support for neurons by providing nutrients and other materials.
  • The axon of many neurons has an outer layer called a myelin sheath.
  • Myelin is a lipid produced by a type of a glial cell known as a Schwann cell.
  • It acts like a layer of insulation, similar to the plastic that encases an electrical cord.
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