CCC

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Author:
seltakahashi30
ID:
12773
Filename:
CCC
Updated:
2010-04-01 01:28:05
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Nervous System
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Description:
Nervous System
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  1. Central Nervous System consists of what?
    Brain and Spinal Cord
  2. Peripheral nervous system consists of what?

    all nerves outside of CNS
  3. What is the Ventricular System?
    Cavities within the brain filled with CSF.
  4. What does the Meninges do?
    • Covers the brain and spinal cord
    • Made of three layers: dura, arachnoid, and pia
    • Subarachnoid space contains CSF, and communicates directly with the ventricular system.
  5. What cells are found in the CNS?
    • Glial Cells-
    • Olgiodendroglia: known as oligiodendrocytes
    • Astroglia: known as astrocytes
    • Microglia
    • Ependymal Cells
  6. What is the function of Oligodendroglia cells?
    Control myelin production and maintenance
  7. What is the function of Astroglia cells?
    Provide transport mechanisms for the exchange of Oxygen, carbon dioxide, and metablolites between blood vessels and neurons
  8. What is the function of Microglia cells?
    Control phagocytosis of injured or damaged cells
  9. What is the function of Ependymal cells?
    Line the ventricular system
  10. What are the cells found in the PNS?
    Schwann Cells and Satellite cells
  11. What is the function of Schwann cells?
    Stimulate myelin production and maintenance
  12. What is the function of Satellite cells?
    Provide physical support of neurons
  13. Functions of CSF?
    • Mechanical support

    • Remove metabolic products from the brain

    • Transport chemical messenger compounds

    • Maintain chemical environment of the brain

  14. How is CSF produced?
    It is produced by the ventricles by choroid plexus.
  15. What is the Blood brain barrier?
    • Is a physiological barrier separating the brain and CSF from substances borne in the blood.
    • Allows brain and CSF composition to be maintained at levels different from those of blood with respect to proteins, ions and others.
  16. What factors affect the Blood Brain Barrier permeability?
    • Inflammation
    • Neovascularity
    • Toxins
    • Infants <6 months of age
  17. What is a neurotransmitter?
    • chemical released by 1 neuron into a specific receptor on an adjacent cell that alters the physiological functioning of the cell.
    • Their function is to propagate an electric impulse from 1 neuron to another.
  18. Types of Neurotransmitters:
    • Norepinephrine: excitatory
    • Dopamine: inhibitory
    • Acetylcholine: excitatory
    • Serotonin: excitatory
    • GABA (gamma-aminobutyric acid): inhibitory
  19. What cells are normally found in CSF?
    lymphocytes and monocytes ratio is 7:3 and reversed in children.
  20. What is the normal value of protein found in CSF?
    • Normally small amounts are found (15-45 mg/dl)
    • High amounts found in infants and elderly.

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