Brainstem S2M1

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Author:
lancesadams
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85178
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Brainstem S2M1
Updated:
2011-08-11 09:48:09
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Ross S2M1
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Neuro
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  1. What is the junction called between the midbrain and the tentorium cerebeli
    Diencephalic junction
  2. What is the junction called between the midbrain and pons
    Pontomesencephalic junction
  3. What is the junction called between the medulla and the pons
    Pontomedullary junction
  4. What is the junction called between the medulla and the spinal cord at the foramen magnum and pyramidal decussation
    Cervicomedullary junction
  5. What are the major landmarks on the ventral end of brain stem
    • Mammilary bodies
    • Olive
    • Pyramids
    • Cerebral peduncle
  6. What are the major landmarks in the dorsal end of the brain stem
    • Pineal gland
    • Superior and Inferior Colliculi
    • Obex
  7. What are the landmarks at the Caudal medulla transection
    • Nucleus Cuneatus
    • Nucleus Gracilis
    • Pyramidal Decussation
  8. What are the landmarks at a Rostral Medulla transection
    • Olive
    • No nucleus cuneatus or gracilis
  9. What landmarks would you see in a transection of the Mid Pons
    Large middle cerebellar peduncles
  10. What landmarks would you see at a Rostral Pons transection
    Pontine Nuclei
  11. What landmarks would you see in a caudal midbrain transection
    • Cerebral Peduncles
    • Superior Colliculi
  12. What are the landmarks for a rostral midbrain transection
    • Mamillary bodies
    • Thalamic Nuclei MGN and LGN
    • Red Nucleus
  13. Somatotopy
    Orderly representation of body parts within a region
  14. In the Dorsal column (Medial Lemniscal) system sensory fibers travel how
    • DRG
    • Fasciculus cuneatus or gracilis
    • Nucleus Gracilis or Cuneatus
    • Arcuate fibers in medulla (cross midline)
    • Medial Lamniscus
    • VPL
    • Somatosensory Cortex
  15. In the Medial Lamniscus System where do you find Fasciculus Gracilis and Cuneatus operating
    • T7 and below = Fasciculus Gracilis
    • T6 and above = Fasciculus Cuneatus
  16. What is the somatotopy of the Spinothalamic System in the anterolateral spinal cord
    Central to outer; Neck, Arm, Trunk, Leg
  17. What are the senses communicated by the Dorsal column (Medial lemniscus) pathway
    • Touch
    • Pressure
    • Proprioception
    • Vibration
    • 2 point discrimination
  18. In the Medial Lemniscus System where do the fibers cross
    Caudal Medulla as the Internal Arcuate Fibers
  19. The Spinothalamic (Anterolateral) sensory fibers travel how
    • DRG
    • Lissauer's tract
    • Substantia gelatinosa
    • Anterior white Commissure (cross)
    • Spinothalamic pathway
    • VPL
    • Somatosensory cortex
  20. The spinothalamic pathway responds to what senses via what fibers
    • Sharp pain/ Crude touch/ Temp
    • Adelta fibers
  21. The spinothalamic pathway has DRG at what levels
    All spinal cord levels
  22. Where do fibers cross in the Spinothalamic pathway
    • Anterior white commissure (may ascend 1-2 levels prior to crossing)
    • Right after entering the spinal cord
  23. How do the sensory fibers travel in the Trigeminal (Fine touch/ Pressure/ Proprioception) pathway
    • Trigeminal tract
    • Trigeminal ganglion
    • Principle Sensory nucleus of V
    • Cross in Pons
    • Trigemino-Thalamic tract
    • VPM
    • Primary Somatosensory cortex
  24. What are the levels of the DRG in the Trigeminal pathway
    Trigeminal Ganglion in Midpons
  25. Where do the Trigeminal fibers cross
    • Midpons for touch pressure and proprioception
    • Caudal medulla for pain and temp
  26. What is unique about the Trigeminal pain/temp pathway
    It may have to descend before ascending to the cortex
  27. What is the pathway of Trigeminal (pain/temp)
    • DRG
    • Trigeminal Ganglion
    • Descending tract of V
    • Spinal nucleus of V
    • Cross in caudal medulla
    • Ascend in trigemino-thalamic tract
    • VPM
    • Primary somatosensory cortex
  28. 85% of the fibers in the Corticospinal tracts cross where
    Decussation of the pyramids
  29. In the anterior corticospinal pathway, where do the fibers cross
    They DO NOT cross but are bilateral
  30. What is the path of the Lateral Corticospinal tract
    • Primary motor cortex
    • Internal Capsule
    • Cerebral Peduncle
    • Pons
    • Decussation of Pyramids (cross)
    • Spinal cord
    • Corticospinal tract (medial or lateral)
  31. How do the upper motor neurons of the Anterior Corticospinal travel
    • Internal capsule through the cerebral peduncle and pons to cervical spinal levels
    • No crossing
  32. How do the lower motor neurons of the Anterior Corticospinal travel
    Throughout the ventral horn with bilateral output to the axial and girdle musculature

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