Chapter 4 - Page 101

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  • The peripheral nervous system
    • As we saw earlier, some nerves are attached to the spinal cord and others are attached directly to the brain.
    • The spinal nerves, attached to the spinal cord, serve all of the body below the neck, conveying sensory information from the body and carrying messages to muscles and glands.
    • The twelve pairs of cranial nerves, attached to the brain, serve primarily muscles and sense receptors in the neck and head.
      • For example, when you taste food, the sensory information gets from your tongue to your brain through one set of cranial nerves.
        • Other sets of cranial nerves bring sensory information to the brain from the eyes, ears and nose.
          • When you chew food, the command to chew reaches your jaw muscles through another set of cranial nerves
            • Still other cranial nerves control the eye muscles, the tongue, the neck muscles and the muscles we use for speech.

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