3.8

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Author:
efrain12
ID:
247674
Filename:
3.8
Updated:
2013-11-18 19:36:48
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Description:
spinal cord anatomy
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  1. what are the bundle of fibers ging to the brain called?
    afferent or sensory tracts
  2. what are the bundle of fibers coming from the brain?
    efferent or motor tracts
  3. By what vertebrae does the spinal cord end?
    at the level of L1 or L2
  4. IN what 2 regions is the spinal cord enlarged?
    -cervical

    -lumbar
  5. why are the cervial and lumbar regions of spine enlarged?
    those are the area that innervate the upper and lower limbs
  6. what does the cervical enlargement form?
    brachial plexus
  7. what does the lumbar enlargement form?
    lumbosacral plexus
  8. what is the conus medullaris?
    pointed cone-shaped end of the spinal cord at L1-2
  9. what is the cauda equina?
    collection of dorsal and ventral nerve roots at the inferior end of the spinal cord filling in the vertebral canal
  10. What are the 3 layers of connective tissue that cover the brain and spinal cord called?
    meninges
  11. 2 characteristics of dura mater
    -outer most layer of meninges

    -very thick and tough
  12. What is the name of the space that lies between the vertebrae and the dura mater?
    epidural space
  13. What forms the lumbar cistern?
    dura mater
  14. what does the lumbar cistern contain?
    cauda equina
  15. 2 characteristics of Arachnoid mater
    -middle layer

    -delicate membrane with numerous fine branching fibers that gives a spider web appearance
  16. what does the subarachnoid space contain?
    • CSF
    • *celebrospinal fluid
  17. where is the subarachnoid located between?
    -arachnoid and the Pia mater
  18. 2 characteristics of Pia Mater
    -inner most layer

    -very thin
  19. what are denticulate ligaments?
    extensions of the Pia that attach the spinal cord to the arachnoid and dura
  20. do the denticulate ligaments run the length of the spinal cord?
    yes
  21. what do the filum terminale do?
    holds the spinal cord to the sacrum
  22. description of filum terminale
    -thin, threadlike extension of the pia mater
  23. what is a lumbar puncture or spinal tap used for?
    to obtain CSF from the lumbar cistern
  24. what is the spinal tap an important diagnositc tool for?
    variety of nervous system disorders
  25. what two locations does the needle pass in a spinal tap?
    -L3 and L4 or L4 and L5

    -Ligamentum flavum
  26. how many pairs of spinal nerves are there on the spine?
    31 pairs
  27. how many cervical spinal nerves are there?
    8
  28. how many thoracic spinal nerves are there?
    12
  29. how many lumbar spinal nerves are there?
    5
  30. how mnay sacral spinal nerves are there?
    5
  31. how many coccygeal spinal nerves are there?
    1
  32. Do mixed spinal nerves contain both efferent and afferent?
    yes
  33. how are mixed spinal nerves formed?
    • joining of 2 roots
    • *ventral and dorsal
  34. what does the dorsal root ganglion contain?
    cell bodies of neurons bringing information into spinal cord
  35. how do the dorsal and ventral rami arise form?
    the splitting of the spinal enrve
  36. where does the ventral ramus go to? (2)
    -anterior and lateral trunk

    -extremities
  37. Where does the dorsal ramus go to?
    deep back
  38. where does the meningeal branch extend to?
    meninges
  39. what does the rami communicantes communicata wth?
    autonomic nervous system
  40. what are dermatomes?
    area of skin innervated by the cutaneous branch of a single spinal nerve

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