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Ascending Tracts Need-to-Know Flashcards

1
Q

What Rexed Lamina are associated with the Gracilis?

A

(Bypass) Does not cross the gray matter

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2
Q

Gracilis neuron pathway (number of and names)

A

3 neuron pathway
1° Nucleus Gracilis (M.O)
2° VPL of Thalamus
3° Post-Central Gyrus

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3
Q

At what cord levels are the Gracilis tract found?

A

Found in ALL CORD LEVELS

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4
Q

At what cord levels is input to the Gracilis found?

A

Input from T5-T6 and below only

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5
Q

Where does the gracilis tract originate/synapse?

A

In the peripheral tissues of LOWER EXTREMITIES (particularly distal parts)

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6
Q

Where is Gracilis decussation (cross over)?

A

The secondary neuron crosses over as the INTERNAL ARCUATE FIBERS in the M.O.

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7
Q

What are the Gracilis modalities (sensations)?

A
  • Discrimination in touch (2 point test)
  • Vibratory sensations
  • Kinesthetic sensation (conscious proprioception)
  • position and movement of body parts perception
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8
Q

What Rexed Lamina are associated with the Cuneatus Tract?

A

(Bypass) Does not cross the gray matter

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9
Q

Cuneatus neuron pathway (number of and names)

A

3 neuron pathway
1° Nucleus Cuneatus
2° VPL of Thalamus
3° Post-Central Gyrus

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10
Q

At what cord levels is the Cuneatus tract found?

A

Found only in UPPER CORD LEVELS Input T5-T6 and up only

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11
Q

Where does the cuneatus tract originate/synapse?

A

In the Peripheral tissues of the upper extremities (particularly distal parts)

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12
Q

Where does the Cuneatus Tract decusation (cross over) occur?

A

The secondary neuron crosses over as the INTERNAL ARCUATE Fibers in the M.O.

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13
Q

Cuneatus modalities (sensations)?

A
  • Discrimination in touch (2 point test)
  • Vibratory sensations
  • Kinesthetic sensation (conscious proprioception)
  • position and movement of body parts perception
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14
Q

The Anterior Spinothalamic Tract is associated with what Rexed Lamina?

A

III, IV

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15
Q

At what cord levels is input to the Cuneatus Tract found?

A

Input from T5-T6 and up only

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16
Q

At what cord levels is the Anterior Spinothalamic Tract found?

A

Found in ALL CORD LEVELS

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17
Q

At what cord levels is input to Anterior Spinothalamic Tract found?

A

Input from all cord levels

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18
Q

Where does the Anterior Spinothalamic Tract originate/synapse?

A

Spinal cord

Rexed Lamina III and IV

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19
Q

Where does the Anterior Spinothalamic Tract decussation (cross over) occur?

A

Spinal cord

- GRADUALLY crosses over as it ascends up the spine.

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20
Q

What modalities/(sensations) is the Anterior Spinothalamic Tract associated with?

A

ligth touch

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21
Q

What Rexed Lamina are associated with the Lateral Spinothalamic tract?

A

Rexed Lamina II, V

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22
Q

Lateral Spinothalamic Tract neuron pathway (number of and names)

A

3 neuron pathway
1° Spinal Cord (Rexed Lamina II, V)
2° VPL of Thalamus
3° Post-Central Gyrus

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23
Q

At what cord levels is the Lateral Spinothalamic Tract found?

A

found in ALL CORD LEVELS

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24
Q

Where does the Lateral Spinothalamic Tract receive its input?

A

input from all cord levels

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25
Q

Where does the Lateral Spinothalamic Tract originate?

A

Spinal Cord

- (Rexed Lamina II and V)

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26
Q

Where does the Lateral Spinothalamic Tract decussation/(cross over) occur?

A

Spinal Cord

-Crosses over ABRUPTLY as it ascends up the spine

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27
Q

What modalities/(sensations) is the Lateral Spinothalamic Tract associated with?

A

Pain/thermal

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28
Q

What Rexed Lamina are associated with the Anterior Spinocerebellar Tract?

A

Not usually tested or not applicable

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29
Q

Anterior Spinocerebellar neuron pathway (number of and names)

A

2 neuron pathway
1° Spinal Cord (Grey matter)
2° Ipsilateral Cerebellum (via Superior Cerebellar Peduncle)

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30
Q

At what cord levels is the Anterior Spinocerebellar Tract found?

A

Found in ALL CORD LEVELS

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31
Q

Where does the Anterior Spinocerebellar Tract receive input from?

A

Input mainly from lower body

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32
Q

Where does the Anterior Spinocerebellar Tract originate at?

A

Lumbrosacral grey laminae

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33
Q

Where does the Anterior Spinocerebellar decussation/(crossover) occur?

A

CROSSES OVER 2X

Spinal cord and as they enter the Cerebellum

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34
Q

What are the Anterior Spinocerebellar modalities/(sensations)?

A

Gross movements of the lower body

-(Unconscious)

35
Q

What Rexed Lamina are associated with the Posterior Spinocerebellar Tract?

36
Q

Posterior Spinocerebellar neuron pathway (number of and names)

A

2 neuron pathway
1° Clark’s Nucleus (AKA Nucleus Dorsalis or Clark’s Column)
2° Ipsilateral Cerebellum

37
Q

At what cord levels is the Posterior Spinocerebellar Tract found?

A

Found from L3 and above

38
Q

Where does the Posterior Spinocerebellar Tract receive input from?

A

Input from all cord levels

39
Q

Where does the Posterior Spinocerebellar Tract originate?

A

C8-L3

  • Rexed Lamina VII
  • Clark’s Nucleus (AKA Nucleus Dorsalis)
40
Q

Where does the Posterior Spinocerebellar Tract decussation/(cross over) occur?

A

DOES NOT cross over

41
Q

What are the modalities/(sensations) of the Posterior Spinocerebellar tract?

A

Fine motor movement

Proprioception of lower body (unconscious)

42
Q

What Rexed Lamina are associated with the Cuneocerebellar Tract?

A

Not usually tested or not applicable

43
Q

Cuneocerebellar neuron pathway (number of and names)

A

2 neuron pathway
1° Accessory Cuneate Nucleus (M.O.)
2° Ipsilateral Cerebellum

44
Q

At what cord levels is the Cuneocerebellar tract?

A

Not usually tested or not applicable

45
Q

Where does the Cuneocerebellar tract decussation/(crossover) occur?

A

DOES NOT cross over

46
Q

What are the modalities/(sensations) of the Cuneocerebellar tract?

A

Fine proprioceptive movement from the SHOULDER GIRDLE

47
Q

Is the pathway the same as a tract?

A

NO

- The tract is only 1 neuron usually occupying the length of the spinal cord

48
Q

The entire length that sensory information travels to the cortex (Cerebral or Cerebellar) is called?

49
Q

Which tracts are the only ascending tracts that DO NOT synapse in the spinal cord?

A

Gracilis and Cuneatus

50
Q

Lesions on which tract lead to analgesia (loss of pain sensation) and thermoanaesthesia (loss of temperature sensation) of the opposite side of the body?

A

Lateral Spinothalamic

51
Q

The Anterior Spinocerebellar tract enters the Ipsilateral Cerebellum through what?

A

Superior Cerebellar Peduncle

52
Q

The Posterior Spinocerebellar tract enters the Ipsilateral Cerebellum through what?

A

Inferior Cerebellar Peduncle

53
Q

Which tract receives input below L3 by “Hitch-hiking” with the Gracilis Tract?

A

Posterior Spinocerebellar

54
Q

Which tract enters the Ipsilateral Cerebellum through the Inferior Cerebellar Peduncle?

A

Cuneocerebellar

55
Q

Where will symptoms be if there is a spinal lesion involving the Gracilis Tract?

A

On the same side as the lesion.

-Its an Ipsilateral tract so Ipsilateral symptoms

56
Q

Where will symptoms be if there is a spinal lesion involving the Cuneatus Tract?

A

On the same side as the lesion.

-Its an Ipsilateral tract so Ipsilateral symptoms

57
Q

Where will symptoms be if there is a spinal lesion involving the Anterior Spinothalamic Tract?

A

On the opposite side of the lesion.

-Its a Contralateral tract so Contralateral symptoms

58
Q

Where will symptoms be if there is a spinal lesion involving the Lateral Spinothalamic Tract?

A

On the opposite side of the lesion.

-Its a Contralateral tract so Contralateral symptoms

59
Q

Where will symptoms be if there is a spinal lesion involving the Anterior Spinocerebellar Tract?

A

On the opposite side of the lesion.

-Its a Contralateral tract so Contralateral symptoms

60
Q

Where will symptoms be if there is a spinal lesion involving the Posterior Spinocerebellar Tract?

A

On the same side as the lesion.

-Its an Ipsilateral tract so Ipsilateral symptoms

61
Q

Where will symptoms be if there is a spinal lesion involving the Cuneocerebellar Tract?

A

On the same side as the lesion.

-Its an Ipsilateral tract so Ipsilateral symptoms

62
Q

Which Ascending tracts are contralateral tracts?

A
  • Anterior Spinothalamic
  • Lateral Spinothalamic
  • Anterior Spinocerebellar
63
Q

What ascending tract is not found in all cord levels?

A

Posterior Spinocerebellar

64
Q

What ascending tract(s) do not crossover?

A
  • Posterior Spinocerebellar

- Cuneocerebellar

65
Q

What is the Gracilis Pathway for its primary neuron?

A

Lower Extremity Tissue ==> Spinal Cord ==> Nucleus Gracilis (MO)

66
Q

What is the Gracilis Pathway for its secondary neuron?

A

Nucleus Gracilis (MO) ==> Internal Arcuate Fibers ==> Medial Lemniscus ==> VPL of Thalamus

67
Q

What is the Gracilis Pathway for its tertiary neuron?

A

VPL of Thalamus ==> Post-Central Gyrus

68
Q

What is the Cuneatus Pathway for its primary neuron?

A

Upper Extremity Tissue ==> Spinal Cord ==> Nucleus Cuneatus (MO)

69
Q

What is the Cuneatus Pathway for its secondary neuron?

A

Nucleus Gracilis (MO) ==> Internal Arcuate Fibers ==> Medial Lemniscus ==> VPL of Thalamus

70
Q

What is the Cuenatus Pathway for its tertiary neuron?

A

VPL of Thalamus ==> Post-Central Gyrus

71
Q

What is the Anterior Spinothalamic Pathway for its primary neuron?

A

Peripheral Tissue ==> Spinal Cord (R.L. 3 and 4)

72
Q

What is the Anterior Spinothalamic Pathway for its secondary neuron?

A

Spinal Cord (R.L. 3 and 4) ==> VPL of the Thalamus

73
Q

What is the Anterior Spinothalamic Pathway for its tertiary neuron?

A

VPL of the Thalamus ==> Post-Central Gyrus

74
Q

What is the Lateral Spinothalamic Pathway for its primary neuron?

A

Peripheral Tissue ==> Spinal Cord (R.L. 2 and 5)

75
Q

What is the Lateral Spinothalamic Pathway for its secondary neuron?

A

Spinal Cord (R.L. 2 and 5) ==> VPL of the Thalamus

76
Q

What is the Lateral Spinothalamic Pathway for its tertiary neuron?

A

VPL of the Thalamus ==> Post-Central Gyrus

77
Q

What is the Anterior Spinocerebellar Pathway for its primary neuron?

A

Peripheral tissue (Lower body) ==> Spinal Cord

78
Q

What is the Anterior Spinocerebellar Pathway for its secondary neuron?

A

Spinal Cord ==> Superior Cerebellar Peduncle ==> Cortex of CEREBELLUM

79
Q

What is the Posterior Spinocerebellar Pathway for its primary neuron? (option 1)

A

Peripheral Tissue (Thru L3 to ~C8) via Gracilis Tract ==> Spinal Cord (Clark’s Nucleus)

80
Q

What is the Posterior Spinocerebellar Pathway for its secondary neuron? (option 1)

A

Spinal Cord (Clark’s Nucleus) ==> Inferior Cerebellar Peduncle ==> Cortex of CEREBELLUM

81
Q

What is the Posterior Spinocerebellar Pathway for its primary neuron? (option 2)

A

Peripheral Tissue (Below L3) via Gracilis Tract ==> Spinal Cord (Clark’s Nucleus)

82
Q

What is the Posterior Spinocerebellar Pathway for its secondary neuron? (option 2)

A

Spinal Cord (Clark’s Nucleus) ==> Inferior Cerebellar Peduncle ==> Cortex of CEREBELLUM

83
Q

What is the Cuneocerebellar Pathway for its primary neuron?

A

Shoulder Girdle ==> Accessory Cuneate Nucleus (MO)

84
Q

What is the Cuneocerebellar Pathway for its secondary neuron?

A

Accessory Cuneate Nucleus (MO) ==> Inferrior Cerebellar Peduncle ==> Cortex of Cerebellum

CNS (4 decks)

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