chapter 8

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thom.mccusker@gmail.com
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chapter 8
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2011-05-02 13:42:12
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chapter 8
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  1. tracts
    white matter of the CNS contains bundles of axons that share common origins, destinations, & functions
  2. white matter of the CNS contains bundles of axons that share common origins, destinations, & functions
    tracts
  3. columns
    larger groups of tracts formed in the spinal chord
  4. larger groups of tracts formed in the spinal chord
    columns
  5. nerves
    axons bundled together in white matter of the PNS
  6. axons bundled together in white matter of the PNS
    nerves
  7. center
    collection of neuron cell bodies w/ a common function
  8. collection of neuron cell bodies w/ a common function
    center
  9. neural cortex
    thick layer of gray matter that covers portions of the brains
  10. thick layer of gray matter that covers portions of the brains
    neural cortex
  11. pathways
    link the centers of the brain w/ the rest of the body
  12. link the centers of the brain w/ the rest of the body
    pathways
  13. meninges
    3 layers of specialized membranes that surround the brain & spinal cord, provide physical stability & shock absorbtion to CNS tissue
  14. 3 layers of specialized membranes that surround the brain & spinal cord, provide physical stability & shock absorbtion to CNS tissue
    meninges
  15. layers of meningeal
    • 1) dura matter
    • 2) arachnoid
    • 3) pia matter
    • (DAP)
  16. 1) dura matter2) arachnoid3) pia matter (DAP)
    layers of meningeal
  17. dura folds
    • a) inner layer of dura mater that extends deep into the cranial cavity
    • b) acts like seat belts to hold brain in position
    • c) large collecting veins (dural sinuses) lie between 2 layers of dura fold
  18. a) inner layer of dura mater that extends deep into the cranial cavityb) acts like seat belts to hold brain in positionc) large collecting veins (dural sinuses) lie between 2 layers of dura fold
    dura fold
  19. epidural space
    between dura mater of spinal cord & walls of the vertebral canal
  20. between dura mater of spinal cord & walls of the vertebral canal
    epidural space
  21. arachnoid
    • a) narrow subdural space separates the inner surface of the dura mater from the 2nd meningeal layer
    • b) contains small quantity of lymphatic fluid, wh/ reduces friction between the opposing surfaces
  22. a) narrow subdural space separates the inner surface of the dura mater from the 2nd meningeal layerb) contains small quantity of lymphatic fluid, wh/ reduces friction between the opposing surfaces
    arachnoid
  23. dorsal root ganglia
    • a) contain the cell bodies of sensory neurons
    • b) every spinal segment is associated with a pair of dorsal root ganglia
  24. dorsal roots
    bring sensory info to the spinal cord
  25. bring sensory info to the spinal cord
    dorsal roots
  26. ventral roots
    contains axons of CNS motor neurons that control muscles & glands
  27. contains axons of CNS motor neurons that control muscles & glands
    ventral roots
  28. autonomic nervous system (ANS)
    • coordinates functions...
    • 1) cardiovascular
    • 2) respiratory
    • 3) digestive
    • 4) excretory
    • 5) reproductive
  29. coordinates functions... 1) cardiovascular 2) respiratory 3) digestive 4) excretory 5) reproductive
    autonomic nervous system (ANS)
  30. preganglionic neurons
    ANS motor neurons in the CNS
  31. ANS motor neurons in the CNS
    preganglionic neurons
  32. preganglionic fibers
    axons of preganglionic neurons
  33. axons of preganglionic neurons
    preganglionic fibers
  34. what do ANS motor neurons (preganglionic neurons) do?
    send their axons (preganglionic fibers) to autonomic ganglia outside the CNS.
  35. send their axons (preganglionic fibers) to autonomic ganglia outside the CNS.
    what do ANS motor neurons (preganglionic neurons) do?
  36. where do ANS motor neurons (preganglionic neurons) synapse?
    on ganglionic neurons.
  37. on ganglionic neurons.
    where do ANS motor neurons (preganglionic neurons) synapse?
  38. ANS axons (postganglionic fibers) outside of the CNS
    leave the ganglia & innervate cardiac muscle, smooth muscles, glands, & fat cesll.
  39. leave the ganglia & innervate cardiac muscle, smooth muscles, glands, & fat cesll.
    ANS axons (postganglionic fibers) outside of the CNS
  40. preganglionic fibers from the thoracic & lumbar segment form...
    sympathetic devision ("fight or flight") of ANS.
  41. preganglionic fibers leaving the brain & sacral segments form...
    the parasympathetic division ("rest & repose" or "rest & digest" system).

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