Neuro clinicals #25-26.txt

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Neuro clinicals #25-26.txt
2011-04-01 19:30:01
Neuro clinicals

Neuro clinicals #25-26
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  1. What A provides the post. limb of internal capsule?
    Lenticulostriate (off of MCA)
  2. What A supplies the trigeminal tract and nucleus in the caudal/rostral medulla?
  3. Do paths through the Gracilis and Fasciculus provide the contralateral or ipsilateral body? Why?
    • Ipsilateral
    • * This occurs b/c their axons do not decussate to become the medial lemniscus until the caudal medulla
  4. What is a brown-sequard hemisection?
    • When half of the spinal cord is affected.
    • Ipsilateral discriminative touch is gone (PCMLS)
    • Contralateral pain/temp gone (ALS)
  5. For any ALS deficit, is the loss of sensation at the lesion or below?
    Below by 1-2 sections due to oblique crossing over through the white commisure
  6. At what spinal level do you start to lose sensation to the UE?
    C5-T1 (since decussation has not occured in the fasciculus cuneatus at T6)
  7. What is Syringomyelia?
    • Fluid filled cyst in Anterior White commisure of SC
    • blocks crossing over of ALS fibers
    • Leads to loss of bilateral pain/temp sensation
  8. What 2 Arteries supply the ALS in the SC?
    • Arterial Vasocorona
    • Anterior Spinal Cord branches
  9. In the PONS, what A supplies the Trigeminal system and the ALS?
  10. At what level do you no longer see the Trigeminal Nucleus and tract?
    Rostral Pons
  11. What nucleus and tract appears at the Rostral Pons?
    Mesencephalic Tract and nucleus
  12. What sensation is loss if you impede blood to the lenticulostriate A? What area of the brain is impeded?
    • sensation: all somatosensory sensation from body
    • Brain area: Posterior limb of internal capsule (final nucleus for all locations)