Neuro Exam 4.2

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brau2308
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216341
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Neuro Exam 4.2
Updated:
2013-04-28 13:39:59
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neurology neuoanatomy neuoscience
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review of neuro part 2 for exam 4
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  1. Which motor control system is the corticobulbar tract a part of?
    pyramidal system
  2. What does the corticobulbar tract control?
    voluntary contralateral skeletal mm activity of head and neck, mm of facial expression, extrinsic eye mm, tongue, mastication, neck, pharynx, larynx, and scalp
  3. Is the corticobulbar tract bilateral or unilateral?
    bilateral except for CN VII and XII
  4. Where are the cell bodies of the corticobulbar tract?
    precentral gyrus of frontal lobe
  5. What become the corticobulbar tract?
    axons
  6. The UMN of the corticobulbar tract initiate motor activity using:
    cranial nn
  7. Describe the descend of the corticobulbar tract:
    • descend through posterior limb of internal capsule (PLIC)
    • may pass through crus cerebri of cerebral peduncles of midbrain
    • some go to midbrain, some continue coursing through ventral pons and some continue on into medulla
  8. Where do the UMN of the corticobulbar tract decussate?
    region of brain stem to which they are going
  9. Where do UMNs of the corticobulbar tract synapse with LMNs?
    CN motor nuclei in tegmentum of brainstem
  10. What do the LMNs of the corticobulbar tract become a part of?
    cranial nerve
  11. What does a bilateral projection pattern mean?
    do not lose function if it becomes damaged b/c there is input from both sides of the brain
  12. What is the exception to the bilateral projection pattern?
    CN VII and XII have unilateral decussating pattern
  13. In a unilateral pattern, the L side controls:
    the L and the R controls the R
  14. Will you see a stroke affect in CN VII and XII?
    yes, b/c there is no compensation by a bilateral projection pattern
  15. Which CNs are associated with the midbrain?
    3 and 4
  16. Which CNs are associated with pons?
    5, 6, 7, and 8
  17. Which CNs are associated with the medulla?
    CN 9, 10, 11, and 12
  18. Which type of tracts are the cranial nerve tracts?
    corticobulbar tracts
  19. Which CNs don't have motor input?
    CN I (olfactory), II (optic), VIII (vestibulocochlear)
  20. Which CNs have unilateral projection patterns?
    CN VII (facial) and XII (hypoglossal)
  21. How many motor functions does the Oculomotor nerve have?
    2
  22. Which CN is the oculomotor N?
    CN III
  23. What are the motor functions of the oculomotor nerve?
    • innervates extrinsic eye mm and levator palpebrae superioris
    • innervates iris and ciliary body
  24. What are the extrinsic eye mm?
    superior rectus, medial rectus, inferior rectus, and inferior oblique
  25. What type of input does CN III receive to innervate extrinsic eye mm and levator palpebrae sup?
    bilateral from UMN in corticobulbar tract
  26. Where are teh cell bodies of LMN of CN III that innervate extrinsic eye mm and levator palpebrae sup?
    oculomotor nuclear complex in tegmentum of midbrain
  27. What type of response is the innervation of the iris and ciliary body?
    parasympathetic
  28. What controls the parasympathetic system and therefore innervation of iris and ciliary body?
    hypothalamus, not the UMN
  29. Which motor control system is responsible for CN III innervating the iris and ciliary body?
    extrapyramidal system b/c involuntary movement
  30. Where are the preganglionic parasympathetic neurons of CN III that innervate the iris and ciliary body?
    Edinger-Westphal nucleus in tegmentum of midbrain
  31. Is the part of CN III that innervates iris and ciliary body a part of the corticobulbar tract?
    • no b/c it is a reflex
    • there is no bilateral innervation input
  32. Where do the pregang parasympathetic neurons of the CN III that innervate the iris and ciliary body synapse w/ postgangl?
    ciliary ganglia
  33. Where do the postganglionic parasympathetic neruons of the CN III go to?
    innervate iris (miosis-contraction of pupil) and ciliary body of lens (accommodation)
  34. Which CN is the trochlear nerve?
    CN IV
  35. What does CN IV innervate?
    superior oblique extrinsic eye m
  36. What type of input does the trochlear nerve receive?
    bilateral from UMN in corticobulbar tract
  37. Where are the cell bodies of the LMNs of the trochlear nerve?
    trochlear motor nucleus in tegmentum of midbrain
  38. Which CN is the trigeminal nerve?
    CN V
  39. Which part is the CN V3?
    mandibular; mixed nerve
  40. What does CN V3 innervate?
    mm of mastication
  41. What are the mm of mastication?
    medial and lateral ptyergoid, masseter, and temporalis mm
  42. What type of input does CN V3 receive?
    bilateral from UMN in corticobulbar tract
  43. Where are the cell bodies of LMN of CN V?
    motor nucleus of V
  44. Where are all LMN of the trigeminal nerve contained?
    mandibular nerve (V3)
  45. Which CN is the abducens nerve?
    CN VI
  46. What does the abducens nerve innervate?
    lateral rectus extrinsic eye m
  47. What is the function of the lateral rectus extrinsic eye m?
    abduct the eye
  48. What type of input does the abducens nerve receive?
    bilateral input from UMN in corticobulbar tract
  49. What contains cell bodies of LMN of abducens nerve?
    abducens motor nucleus in tegmentum of pons

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