Think About It

What features essential to regeneration, present in the PNS, are lacking from the CNS?

Before You Go On

Answer the following questions to test your understanding of the preceding section:

  1. How is a glial cell different from a neuron? List the six types of glial cells and discuss their functions.
  2. How is myelin produced? How does myelin production in the CNS differ from that in the PNS?
  3. How can a severed peripheral nerve fiber find its way back to the cells it originally innervated?

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