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Ascending Sensory Pathways Flashcards

0
Q

What are the 1st order neurons for DCML pathway?

A

Dorsal root ganglia; Axons ascend as Fasciculus gracilis (LE) and Fasciculus Cuneatus (UE)

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1
Q

What does the Dorsal Column Medial Lemniscal Pathway (DCML) carry?

A

Discriminative tactile sensations from the body

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2
Q

What are the 3rd order nuclei for the DCML pathway?

A

VPL in Thalamus

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3
Q

What are the 2nd order nuclei for DCML?

A

Nucleus Gracilis (LE) and Nucleus cuneatus (UE) Axons ascend as Medial Lemniscus

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4
Q

What is the destination for the DCML pathway?

A

Primary Somatosensory Cortex

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5
Q

Where does the DCML pathway decussate?

A

2nd order axons cross in the Medulla (fibers called internal Arcuate Fobers that represent sensory decussation for discriminative sense)

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6
Q

What is the DCML innervated by?

A

by A-beta afferents that (enter the SC in medial regions of Lissauer’s tract )

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7
Q

What does the Trigmenial Lemniscal pathway carry?

A

Discriminative tactile sensations form the face

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8
Q

What is the 1st order neuron for Trigmenial Lemniscal pathway?

A

Trigmenial ganglion in pons

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9
Q

What is the 2nd order neuron for Trigmenial Lemniscal pathway?

A

Trigmenial main sensory nucleus (axons ascend as Trigmenial Lemniscus)

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10
Q

What is the 3rd order neuron for Trigmenial Lemniscal pathway?

A

VPM in thalamus

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11
Q

What is the destination for Trigmenial Lemniscal pathway?

A

Primary Somatosensory cortex

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12
Q

What is the decussation for Trigmenial Lemniscal pathway?

A

2nd order axons cross in the PONS

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13
Q

What is the innervation for Trigmenial Lemniscal pathway?

A

A-beta afferents

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14
Q

What does the Spinothalamic Tract carry?

A

Pain, thermal sense, and crude touch from body

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15
Q

What is the 1st order neuron for the (lateral) Spinothalamic tract?

A

DRG (A-delta and C afferents)

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16
Q

What is the 2nd order neuron for the (lateral) Spinothalamic tract?

A

Substantia gelantinosa of Rexed’s lamina II

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17
Q

What is the 3rd order neuron for the (lateral) Spinothalamic tract?

A

VPL in Thalamus

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18
Q

What is the destination for the (lateral) Spinothalamic tract?

A

Primary Somatosensory cortex

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19
Q

What is the decussation for the (lateral) Spinothalamic tract?

A

2nd order sensory axons in SC (anterior white commisure) w/in 1-2 levels of entering the SC

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20
Q

What do some fibers in the (lateral) Spinothalamic tract terminate as?

A

Brainstem reticular formation and are called spinoreticular tract fibers

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21
Q

What does the Trigeminothalmic tract carry?

A

carries pain and thermal sense from free nerve endings and heat and cold receptors in the face

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22
Q

What is the 1st order neuron for the Trigeminothalmic tract?

A

Trigeminal ganglion (A-delta and C afferens)

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23
Q

What is the 2nd order neuron for the Trigeminothalmic tract?

A

Spinal nucluds of the trigeminal nerve in the MEDULLA

remember: They descended ipsilaterally when they entered the pons and synapsed on neurons

24
Q

What is the 3st order neuron for the Trigeminothalmic tract?

A

VPM in the Thalamus

25
Q

What is the destination of the Trigeminothalmic tract?

A

Primary somatosensory

26
Q

How did the Trigeminothalmic tract descend to get to 2nd order?

A

Ipsilaterally

27
Q

What does the Dorsal Spinocerebellar tract carry (DSCT)?

A

Unconscious proprioceptive info from LE (lower)

28
Q

What is the 1st order neuron for Dorsal Spinocerebellar tract (DSCT)?

A

DRG (group Ia, Ib, II afferens)

29
Q

What is the 2nd order neuron for Dorsal Spinocerebellar tract (DSCT)?

A

Clarke’s column (some alpha neurons directly)

30
Q

What is the 3rd order neuron for Dorsal Spinocerebellar tract (DSCT)?

A

None terminates in Vermis!

31
Q

What is the destination for Dorsal Spinocerebellar tract (DSCT)?

A

Cerebellum via Inferior Cerebellar Peduncle

32
Q

What is the decussation neuron for Dorsal Spinocerebellar tract (DSCT)?

33
Q

What is the information for Dorsal Spinocerebellar tract (DSCT) used for?

A

Fine coordination of posture and movement of the limb muscles (mostly Lower Extremity)

34
Q

What does the Spinocuneocrebellar tract (SCCT) carry?

A

Unconscious proprioceptive info from the UE (upper)

35
Q

What are the 1st order neurons for Spinocuneocrebellar tract (SCCT)?

A

DRG (axons ascend in Fasciculus Cuneatus)

36
Q

What are the 2nd order neurons for Spinocuneocrebellar tract (SCCT)?

A

Nucleus cuneatus

37
Q

What are the 3rd order neurons for Spinocuneocrebellar tract (SCCT)?

38
Q

What is the destination for Spinocuneocrebellar tract (SCCT)?

A

Cerebellum (Inferior Peduncle)

39
Q

What is the information for Spinocuneocrebellar tract (SCCT) used for?

A

In Fine coordination of posture and movement of UE (upper)

40
Q

What does the Ventral(Anterior) Spinocerebellar tract (VSCT) carry?

A

Info about descending motor signals to THORAX and LUMBAR of SC

41
Q

What are the 1st order neurons for Ventral Spinocerebellular tract (VSCT)?

A

Rexed Lamina 5, 6, and 7 of thorax and lumbar SC; axons ascend in Lateral Funiculus

42
Q

What are the 2nd order neurons for Ventral Spinocerebellular tract (VSCT)?

43
Q

What are the 3rd order neurons for Ventral Spinocerebellular tract (VSCT)?

44
Q

What is the destination for Ventral Spinocerebellular tract (VSCT)?

A

Bilaterally to Cerebellum via Superior Peduncle

45
Q

What is the decussation for Ventral Spinocerebellular tract (VSCT)?

A

1st order axons in SC (anterior white commissure)

46
Q

What happens to the Ventral Spinocerebellular (VSCT) fibers?

A

Most fibers cross again the cerebellum and are ipsilateral to the stimulus *(Some can remain contralateral from the side of stimulus)

47
Q

What does the Rostral Spinocerebellular tract (RSCT) carry?

A

info about descending motor signals to cervical SC

48
Q

What are the 1st order neurons for Rostral Spinocerebellular tract (RSCT)?

A

Rexed Lamina 5, 6, and 7 of cervical SC

49
Q

What is the destination for Rostral Spinocerebellular tract (RSCT)?

A

Cerebellum (via Superior and Inferior Peduncle)

50
Q

Lesion on the Periphery region for DCML will cause?

A

Ipsilateral loss

51
Q

Lesion on the Spinal region for DCML will cause?

A

ipsilateral loss

52
Q

Lesion on the Medulla region for DCML will cause?

A

Contralateral loss (lower medulla)

53
Q

Lesion on the Cerebrum, Midbrain, and pons regions for DCML will cause?

A

Entire contralateral loss

54
Q

Lesion on the Periphery region for Spinothalamic Tract will cause?

A

ipsilateral loss

55
Q

Lesion on the Spinal region for Spinothalamic Tract will cause?

A

Contralateral loss

56
Q

Lesion on the Medulla region for Spinothalamic Tract will cause?

A

Mixed hemianesthesia (upper medulla/ lower pons)

57
Q

Lesion on the Cerebrum, Midbrain, and Pons regions for Spinothalamic Tract will cause?

A

Entire contralateral loss

Neuroscience Ascending pathways (1 decks)

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