Anatomy & Physiology › Section L · Anatomy of the nervous system › Topic L.4
The peripheral nervous system and cranial nerves
The peripheral nervous system is the wiring that connects the brain and spinal cord to everything else. Its layout is regular enough to learn: 12 pairs of cranial nerves, 31 pairs of spinal nerves, four main plexuses and a set of ganglia.
In this topic
- What the PNS is made of
- Inside a nerve
- Cranial nerves I to VI
- Cranial nerves VII to XII
- Sensory, motor or both
- Spinal nerves and their roots
- Plexuses and named nerves
- Worked example: which cranial nerve?
- Worked example: spinal nerve levels
- Common mistakes to avoid
- Key takeaways
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