5/10 Nervous system revised
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Transcript

  • 1. The Nervous System
  • 2. Role of the nervous system
    • respiratory center
    • defense (ex: pain stimuli)
    • relay information (ex: hunger, full bladder)
  • 3. Functions of the nervous system
    • receives information
    • interprets the information
    • makes the body respond or react
  • 4. Nerve cell
  • 5. Structure and Functions –Nerve cell
    • also called neuron
    • scattered throughout the body
    • born with all the neurons that you would need (none grows or regenerates)
  • 6. Parts of a neuron
    • dendrites
    • axon
    • nucleus
    • cytoplasm
    • interneurons*
    • *HW: 1) What are interneurons?
    • 2) What is a soma/perikaryon?
  • 7. Axon
    • threadlike structure
    • carries impulses away from the nerve cell body
    • may have a myelin sheath (myelinated)
  • 8. Dendrites
    • looks like fibers branching out
    • receives impulses or stimuli
  • 9. Afferent or Efferent? Sensory or Motor?
    • Pick up information, sends it to CNS
    • From CNS, sends out orders
  • 10. Structure and Functions- Neuroglia
    • Also called glia
    • Does not transmit impulses
    • For protection and nourishment
  • 11. Kinds of Glia
    • Astrocytes –pass nutrients between blood capillaries and neurons
    • Microglia – engulf foreign materials and bacteria
    • Oligodendroglia, Schwann cells*- insulate axons of neurons
    • *HW: Are oligodendroglia and Schwann cells the same thing?
  • 12.  
  • 13. Central nervous system
    • brain
    • spinal cord
  • 14. Brain
    • cerebrum
    • cerebellum
    • brain stem
    • diencephalon
  • 15. Spinal Cord
  • 16. Peripheral Nervous System
    • cranial nerves
    • spinal nerves
    • peripheral nerves
  • 17. Autonomic Nervous System
    • Sympathetic
    • Parasympathetic
  • 18.
    • (I) O
    • (II)* O
    • (III) O
    • (IV) T
    • (V) T
    • (VI) A
    • (VII) F
    • (VIII) A
    • (IX) G
    • (X) V
    • (XI) S
    • (XII) H
  • 19.
      • Olfactory (I) – sensory (olfactory)
      • Optic (II) – not a true nerve
      • Oculomotor (III) – motor (extrinsic eye muscles)
      • Trochlear (IV) – motor (extrinsic eye muscles)
      • Trigeminal (V) – sensory &motor (skin of head, teeth, jaws)
      • Abducens (VI) – motor (extrinsic eye muscles)
      • Facial (VII) – sensory (taste buds) & motor (2 nd hyoid arch)
      • Auditory (VIII) – aka octaval; sensory (inner ear)
      • Glossopharyngeal (IX) – sensory (taste buds, gill pouches) & motor (3 rd hyoid arch)
      • Vagus (X) – sensory & motor (mouth, pharynx, viscera)
      • Spinal Accessory (XI) – motor (mastoids, trapezius)
      • Hypoglossal (XII) – motor (hyoid and tongue muscles)