Nervous tissue transmits, receives, and reacts to information about changes in our internal and external environment.

Figure 1. The divisions of the nervous system

CNS and PNS

  • CNS = Central nervous system = Nerve tissue in the cranial cavity and the spinal canal.
    • This includes the brain and spinal cord.
  • PNS = Peripheral nervous system = Nerve tissue outside of the cranial cavity and spinal canal.
    • This includes all peripheral nerves, cranial nerves, ganglia, and plexuses.

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