Spinal Tracts.txt

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Author:
Anonymous
ID:
11431
Filename:
Spinal Tracts.txt
Updated:
2010-03-21 12:02:38
Tags:
spinal tracts usmle step1 jsc
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Description:
Covers the most important spinal tracts
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  1. What is the function of the posterior (dorsal) column-medial lemniscus pathway?
    • tactile discrimination, vibration sensation, conscious proprioception
  2. What receptors are associated with the posterior (dorsal) column-medial lemniscus pathway?
    Pacinian and Meissner's tactile corpuscles, joint receptors, muscle spindles, Golgi tendon organs
  3. Name two tracts in the posterior (dorsal) column.
    • Gracile fasciculus, Cuneate fasciculus
  4. The Gracile fasciculus is responsible for…
    The lower extremity
  5. The cuneate fasciculus is responsible for..
    The upper extremity
  6. The posterior (dorsal) column-medial lemniscus fibers decussate where?
    • Caudal medulla
  7. Transection of the posterior (dorsal) column-medial lemniscus tract above the sensory decussation leads to...
    Contralateral loss of dorsal column modalities
  8. Transection of the posterior (dorsal) column-medial lemniscus tract in the spinal cord leads to...
    ipsilateral loss of dorsal column modalities
  9. What is the function of the lateral spinothalamic tract?
    • Mediates pain and temperature sensation
  10. What receptors are associated with the lateral spinothalamic tract?
    Free nerve endings: fast (A-delta) and slow (C) pain fibers
  11. The lateral spinothalamic tract decussates where?
    • In the white ventral commissure of the spinal cord at the level of the spinal nerve
  12. Transection of the lateral spinothalamic tract leads to…
    contralateral loss of pain and temperature below the lesion
  13. What is the function of the lateral corticospinal tract?
    • Voluntary skilled motor activity of the upper limbs
  14. The lateral corticospinal tract decussates where?
    • The medullary pyramids
  15. Transection of the lateral corticospinal tract above the medullary pyramids leads to…
    Contralateral spastic paresis and Babinski's sign
  16. Transection of the lateral corticospinal tract in the spinal cord leads to...
    Ispilateral spastic paresis and Babinski's sign
  17. Name the tracts affected, and the resulting sequelae, of a spinal cord hemisection.
    • dorsal column: ipsilateral loss of tactile discrimination, position and vibratory sensation; lateral corticospinal tract: ipsilateral spastic paresis; lateral spinalthalamic tract: contralateral loss of pain and temerature sensation; ventral horn: ipsilateral flaccid paralysis
  18. Name the tracts affected, and the resulting sequelae, of ventral spinal artery occlusion.
    • lateral corticospinal tract: bilateral spastic paresis; lateral spinothalamic tract: bilateral loss of pain and temperature sensation; ventral horn: bilateral flaccid paralysis
  19. Name the tracts affected, and the resulting sequelae, of Vitamin B12 neuropathy.
    dorsal column: bilateral loss of tactile discrimination, position and vibratory sensation; lateral corticospinal tract: bilateral spastic paresis; spinocerebellar: bilateral dystaxia
  20. Name the tracts affected, and the resulting sequelae, of Syringomyelia.
    • ventral white commissure: bilateral loss of pain and temperature sensation (loss of lateral spinothalamic decussation); ventral horn: flaccid paralysis

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