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Neuroscience > Exam 3 Ascending Pathways > Flashcards

Exam 3 Ascending Pathways Flashcards

1
Q

What are the first order neurons of the DCML?

A

DRG

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2
Q

What are the second order neurons of the DCML?

A

Nucleus gracilus (LE) and Nucleus cuneatus (UE)

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3
Q

What are the third order neurons of the DCML?

A

Thalamic (VPL)

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4
Q

What is the destination of the DCML?

A

Primary somatosensory cortex

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5
Q

Where does the DCML decussate?

A

Caudal medulla: Internal arcuate Fibers

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6
Q

What are the first order neurons of the TL (Trigeminal Lemniscus)?

A

Trigeminal ganglion

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7
Q

What are the second order neurons of the TL?

A

Main Sensory Nucleus of Trigeminal Nerve

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8
Q

What are the third order neurons of the TL?

A

Thalamic (VPM)

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9
Q

Where does the TL decussate?

A

Pons

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10
Q

What are the first order neurons of the Spinothalamic tract?

A

DRG

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11
Q

What are the second order neurons of the Spinothalamic tract?

A

Substantia gelatinosa Rexed’s lamina II in dorsal horn

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12
Q

What are the third order neurons of the Spinothalamic tract?

A

Thalamus - VPL

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13
Q

Where does the Spinothalamic tract decussate?

A

Anterior White Commissure within 1-2 levels of entering the SC

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14
Q

Does the Spinothalamic tract cross in the brain?

A

No, it crosses in the SC

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15
Q

What is the difference between the second order neurons of the Trigeminal Lemniscal and the Trigeminothalamic tract?

A

The TL 2nd order neurons: Main sensory nucleus of V.

The TT 2nd order neurons: Spinal nucleus of V in Medulla

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16
Q

The does the Trigeminothalamic tract decussate?

A

Medulla

17
Q

How many orders of neurons do the DSCT and SCCT have?

A

Only two

18
Q

What are the first and second order neurons of DSCT?

A

DRG and Clarks column in dorsal horn T6 and below

19
Q

What is the destination of the DSCT SSCT?

A

Cerebellum via inferior cerebellar peduncle

20
Q

Do the DSCT and SSCT decussate?

A

No

21
Q

What are the first order neurons of VSCT and RSCT?

A

Cervical Lamina of V, VI, VII

22
Q

What is the destination of VSCT? RSCT?

A

Bilateral cerebellum via sup. cerebellar peduncle.

Ipsilatera cerebellum via sup. and inf. cerebellar peduncle.

23
Q

A DCML lesion in the cerebrum, midbrain, pons, upper medulla would have what type of loss?

A

Contralateral loss because above caudal medulla

Neuroscience (10 decks)

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