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Neuroglia (glial cells)

By Levi Clancy for Student Reader on

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All but one type of neuroglia (glial cells) are derived from same ectoderm that produces neurons. Most organs are from the mesoderm. There are six categories of neuroglia:

  • Neurolemmocytes (Schwann cells) form myelin layers around axons in the PNS.

  • Oligodendrocytes form myelin layers around axons in the CNS.

  • Microglia are derived from mesoderm and remove foreign and degenerated material in the CNS.

  • Astrocytes help regulate passage of molecules from blood to brain.

  • Ependymal cells line brain ventricles and central canal of spinal cord

  • Ganglionic gliocytes support neuron cell bodies within ganglia off the PNS.