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Chapter 8.4: Nervous System

Chapter 8.4: Nervous System. Meninges. 3 layers of protective membranes Around brain and spinal cord Shock absorption Dura mater Outermost layer Holds brain in place Contains epidural space Anesthetic causes temporary paralysis. Figure 8.13b. Meningitis. Inflammation of the meninges

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Chapter 8.4: Nervous System

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  1. Chapter 8.4: Nervous System

  2. Meninges • 3 layers of protective membranes • Around brain and spinal cord • Shock absorption • Dura mater • Outermost layer • Holds brain in place • Contains epidural space • Anesthetic causes temporary paralysis

  3. Figure 8.13b

  4. Meningitis • Inflammation of the meninges • Due to bacteria or viruses • Disrupt blood flow • Kills neurons and glial cells

  5. Spinal Cord • Central canal • Filled with cerebrospinal fluid

  6. Figure 8.14b

  7. Spinal cord cont… • 31 segments • 1 dorsal root ganglia/segment • Contains sensory neurons • Connect spinal cord to muscles and glands

  8. Figure 8.14a

  9. Figure 8.14b

  10. Spinal cord cont… • Extend only to lumbar vertebrae • Gray matter—cell bodies of neurons and glial cells • White matter—axons

  11. Figure 8.14b

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