Ascending Tracts Flashcards
What information is being conveyed in Dorsal Column- Medial Lemniscus?
2-point touch, light touch, joint position sense, vibration, and pressure.
Where is the 1st order cell bodies located in Dorsal Column- Medial Lemniscus?
Dorsal Root Ganglia (DRG)
Where is the 2nd order cell bodies located in Dorsal Column- Medial Lemniscus?
Nucleus gracilis and nucleus cuneatus
Where is the 3rd order cell bodies located in Dorsal Column- Medial Lemniscus?
Ventral posterior lateral (VPL) nucleus of thalamus
Where does the Dorsal Column- Medial Lemniscus terminate?
Postcentral gyrus and paracentral lobule (posterior part)
What information does Neo- and paleo- spinothalamic tract convey?
Sharp, well localized discriminatory pain, temperature, and light touch
Where is the 1st order cell bodies located in Neo- and paleo- spinothalamic tract? And what type of fibers?
Neo: Dorsal root ganglia (DRG); A- delta fibers
Paleo: C Fibers
Where is the 2nd order cell bodies located in Neo- and paleo- spinothalamic tract?
Neo: Lamina 1, 5 Paleo: Lamina 7, 8
Dorsal horn laminae/ substantia gelatinosia
Is Neo- and paleo- spinothalamic tract crossed? If so, where?
Yes; in ventral white commissure (VWC)
Where is the 3rd order cell bodies located in Neo- and paleo- spinothalamic tract?
VPL (neo), and intralaminar (paleo) thalamic nucleus
Where does Neo- and paleo- spinothalamic tract terminate?
- Postcentral gyrus and paracentral lobule posterior part (Neo)
- Intralaminar thalamic nucleus to widespread cortex
Does Neo- and paleo- spinothalamic tract uses Lissauer’s tract?
YES
Is Neospinothalamic tract ipsilateral or contralateral?
Contralateral
Is Paleo- spinothalamic tract ipsilateral or contralateral?
Contralateral
Lesion at the neospinothalamic tract will cause?
Contralateral loss of pain and temperature at that level and down.
Lesion at the Ventral white commissure of the neospinothalamic tract will cause?
Bilateral loss of pain and temperature at that level ONLY.
Lesion at the DRG of the neospinothalamic tract will cause?
Ipsilateral loss of pain and temperature at that dermatome.
What information does Dorsal Spinocerebellar Tract convey?
Unconscious proprioception (of joints) from the trunk and lower extremities (some touch and pressure)
1st order neuron cell bodies of Dorsal Spinocerebellar Tract is located?
DRG
2nd order neuron cell bodies of Dorsal Spinocerebellar Tract is located?
Clarke’s nucleus (nucleus dorsalis) found in C8/T1- L3
Is Dorsal Spinocerebellar Tract crossed?
NO
Where does Dorsal Spinocerebellar Tract terminate? Via?
Cerebellum via Inferior cerebellar peduncle
At what level is Clarke’s nucleus found, and how does lower levels get to it?
Found at levels of C8-L3; L4 and lower will ride up Dorsal Column in Fasciculus gracilis to ‘find’ Clarke’s nucleus.
Does Dorsal Spinocerebellar Tract use Lissaure’s tract or ALS?
NO
Is Dorsal Spinocerebellar Tract ipsilateral or contralateral?
Ipsilateral
At what lamina is Clarke’s nucleus found?
Lamina 7
What information does Ventral spinocerebellar tract convey?
Unconscious proprioception from trunk and lower extremities, transmits information from locomotor areas, monitor descending tracts (sensory fibers and interneuronal motor pools)
1st neuron cell bodies of Ventral spinocerebellar tract ?
DRG
Does Ventral spinocerebellar tract cross?
Yes; ventral white commissure and recrosses in cerebellum.
Where does Ventral spinocerebellar tract terminate? Via?
Cerebellum via superior cerebellar peduncle
Ventral spinocerebellar tract is _____, leaves in superior cerebellar peduncle. Once it gets to the white matter of cerebellum it goes to the other side, so where it ends up is _____.
Contralateral; ipsilateral
What information is being conveyed by Cuneocerebellar Tract?
Unconscious proprioception from upper extremities
1st order cell bodies of Cuneocerebellar Tract?
DRG
2nd order cell bodies of Cuneocerebellar Tract?
Lateral/accessory cuneate nucleus
Is Cuneocerebellar Tract crossed?
NO
Where does Cuneocerebellar Tract terminate? Via?
Cerebellum via Inferior cerebellar peduncle
Does Cuneocerebellar Tract use Lissaure’s tract?
NO
Is Cuneocerebellar Tract ipsilateral or contralateral?
Ipsilateral
What information is being conveyed by Spino-olivary tract?
Unconscious proprioception (terminates in cerebellum), works with cerebellum for motor learning and making corrections during movements.
1st order cell bodies of Spino-olivary tract?
DRG
2nd order cell bodies of Spino-olivary tract?
Spinal gray
Does Spino-olivary tract cross? If so where?
Yes; ventral white commissure
Where does Spino-olivary tract terminate?
Inferior olivary nucleus. (From there a axon will be going to cerebellum)
What information is being conveyed by Spinoreticular tract?
Cutaneous information associated with alertness, consciousness and dull/ achy pain arouses cortex to stay alert and awake. Autonomic, behavioral and emotional responses to painful stimuli.
1st order cell bodies of Spinoreticular tract?
DRG
2nd order cell bodies of Spinoreticular tract?
Intermediate gray laminae
Is Spinoreticular tract crossed? If so where?
Yes, majority; ventral white commissure
Where does Spinoreticular tract terminate?
Pontine (contralaterally) and medullary (bilaterally) reticular formation. (From there it goes to the VPL)
What information does Spinomesencephalic Tract convey?
Pain
1st order cell bodies of 2nd order cell bodies of Spinomesencephalic tract?
DRG
2nd order cell bodies of Spinomesencephalic tract?
Dorsal horn laminae
Does Spinomesencephalic tract cross? If so where?
Yes; ventral white commissure
Where does Spinomesencephalic tract terminate?
Midbrain: superior colliculus and periaqueductal gray.
Spinomesencephalic tract termination: What is the function of Superior colliculus (Midbrain)?
Spinovisual relex response
Spinomesencephalic tract termination: What is the function of periaqueductal gray (Midbrain)?
Provide descending feedback to dorsal horn via Reticular Fibers to modulate pain circuitry.
Which 3 tracts uses cerebellar peduncle?
Cuneocerebellar, ventral spinocerebellar (sup), and dorsal spinocerebellar
Which 2 tracts are not crossed?
Dorsal spinocerebellar and cuneocerebellar
Which 2 (3) tracts uses ALS?
Spinoreticular, spinomesencephalic (spinotectal), and neo- and -paleo spinothalamic tract
