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Chapter 8.5: Nervous System

Chapter 8.5: Nervous System. Spinal cord injuries. General paralysis Severe damage to spinal cord Loss feeling from injury down Quadriplegia—lose control of both arms and legs. Spinal injuries cont…. Paraplegia Lose control of just the legs Repair Impossible naturally

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Chapter 8.5: Nervous System

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  1. Chapter 8.5: Nervous System

  2. Spinal cord injuries • General paralysis • Severe damage to spinal cord • Loss feeling from injury down • Quadriplegia—lose control of both arms and legs

  3. Spinal injuries cont… • Paraplegia • Lose control of just the legs • Repair • Impossible naturally • No cell division of neurons • Trying artificial division • Uses stem cells

  4. The brain • About 35 billion neurons • About 3 pounds • Cerebrospinal fluid (CSF) • Brain floats in this • Makes brain light • Transports nutrients, neurotransmitters, and wastes • Lumbar puncture—useful in determining CNS disease • Replaced every 8 hours

  5. The cerebrum • Largest part of the brain • Conscious Thought • Intelligence • Gray matter—superficial layer • White matter—deep layer • Contains axons • Gyri—grooves that increase the surface area • Left and Right Lobes • Control opposite sides of the body

  6. Figure 8.16a

  7. Cerebrum cont… • Parietal Lobe • Primary motor cortex • Directs voluntary movements • Primary sensory cortex • Receives somatic sensory information • Ex: Touch, pressure, pain, temperature

  8. Figure 8.16b

  9. Cerebrum cont… • Occipital Lobe • Visual cortex • All visual information

  10. Figure 8.16b

  11. Cerebrum cont… • Frontal Lobe • Gustatory cortex • Taste sensations

  12. Figure 8.16b

  13. Cerebrum cont… • Temporal Lobe • Auditory cortex—hearing • Olfactory cortex—smell

  14. Figure 8.16b

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