AP 1 (11-3)

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Author:
mc166589
ID:
119269
Filename:
AP 1 (11-3)
Updated:
2011-11-27 20:58:38
Tags:
neurons
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Description:
AP 1 chapter 11.
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  1. What are the basic structures of the neuron?
    • Cell body
    • Axon
    • Dendrite
    • Myelin sheaths
  2. Where can cell bodies of neurons be found?
    • Gray matter
    • Ganglia
  3. What function does the cell body fufill in the neuron?
    Controls metabolism
  4. Besides the normal organelles, what two organelles do cell bodies have?
    • Nissl bodies
    • Neurofibrils
  5. What are neurofibrils?
    • microtubules - move material
    • (neurotransmitter, from cell body to end of axon)
  6. Describe the structure of dendrites.
    • Highly branched
    • Very numerous
    • Relatively short
  7. What is the function of dendrites?
    receive and transmit impulses toward cell body
  8. How many axons are connected to a cell body?
    One
  9. Where do axons connect to on a cell body?
    Axon hillock
  10. Describe the structure of an axon.
    • Very in length
    • May have branches
    • At end, many short terminal branches may occur, each ending in synaptic knobs or bulbs that containsecretory vesicles filled with neurotransmitter.
  11. What is the function of an axon?
    transmit nerve impulses away from cell body to another nerve cell, or to an effector cell.
  12. When do cell bodies and dendrites contain myelin sheaths?
    Never
  13. What are the two types of axons and where can they be found?
    • Myelinated - white matter
    • Unmyelinated - gray matter
  14. What forms myelin sheaths in the PNS?
    Schwann cells
  15. The outter layer of the myelin sheaths in the PNS is called what?
    Neurolemma
  16. What gives the white appearence of myelin in the PNS?
    The high lipid content.
  17. What are the nodes of Ranvier and what are their functions?
    • Area between schwann cells that lack myelin.
    • These act as conductive segments that allow nerve impulses to travel.
  18. Oligodendrocytes extend long processes that form _____ in the CNS.
    myelin
  19. cell bodies and cytoplasm remain in spaces between neurons in the CNS, which means that there are no _____.
    Neruolemma
  20. Nodes of Ranveir occur in what?
    • PNS
    • CNS
  21. Because of the absence of _____ in the CNS, it is unlikely that neurons will regenerate after injury.
    Neurolemma
  22. Myelination development is completed when?
    adolescence

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