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NYCC Neuro 1 > Pathways & Lesions > Flashcards

Pathways & Lesions Flashcards

1
Q

Function of Dorsal Columns-Medial Lemniscus

A
  • proprioception
  • vibration
  • discriminatory touch
  • stereognosis
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2
Q

function of spinothalamic tracts

A

pain & temperature

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3
Q

function of ventral spinothalamic tract

A

light/crude touch

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4
Q

function of lateral corticospinal tract

A

motor to distal flexor muscles

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5
Q

function of ventral corticospinal tract

A

motor to core muscles

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6
Q

what are the primary afferent neurons of dorsal columns-medial lemniscus?

A

Fasciculus cuneatus (T6^)
Fasciculus gracilis (T6_)

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7
Q

what are the secondary afferent neurons of dorsal columns-medial lemniscus?

A

medial lemniscus

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8
Q

primary afferent neurons of the dorsal columns-medial lemniscus pathway synapse with _____

A

nucleus cuneatus
nucleus gracilis

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9
Q

where do fibers in the dorsal columns-medial lemniscus cross?

A

great sensory decussation (GSD)

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10
Q

what are the primary afferent neurons of the spinothalamic tracts?

A

dorsolateral fasciculus (DLF)

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11
Q

what do the primary afferent neurons of spinothalamic tracts synapse with?

A

nucleus proprius

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12
Q

what are the secondary afferent neurons of the spinothalamic tract?

A

lateral spinothalamic tract (LSTT)

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13
Q

where do fibers of the spinothalamic tracts cross?

A

ventral white commissure (VWC)

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14
Q

where do secondary afferent fibers of ventral spinothalamic tracts run?

A

alongside lateral spinothalamic tract

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15
Q

where do fibers of lateral corticospinal tract cross?

A

pyramidal decussation (85%)

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16
Q

where do fibers of ventral corticospinal tract cross?

A
  • fibers do not cross at pyramidal decussation (15%) - remain ipsilateral
  • cross at ventral white commissure
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17
Q

what are the UMNs of corticospinal tract?

A

lateral corticospinal tract (LCST)
ventral corticospinal tract (VCST)

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18
Q

what are the LMNs of corticospinal tract?

A

ventral roots (synapse in ventral horn of spinal cord)

19
Q

in all tracts, a lesion above the crossing of fibers will cause ____ loss of function

A

contralateral

20
Q

in all tracts, a lesion below the crossing of fibers will cause ____ loss of function

A

ipsilateral

21
Q

lesion of fasciculus cuneatus at T3

A

ipsilateral loss of proprioception/vibration/touch from T3-T6

22
Q

lesion of fasciculus gracilis at T8

A

ipsilateral loss of proprioception/vibration/touch from T8 down

23
Q

lesion of fasciculus gracilis at T2

A

ipsilateral loss of proprioception/vibration/touch from T6 down

24
Q

lesion of medial lemniscus

A

contralateral loss of proprioception/vibration/touch from C1 down

25
Q

lesion of nucleus cuneatus

A

ipsilateral loss of proprioception/vibration/touch from C1-T6

26
Q

lesion of nucleus gracilis

A

ipsilateral loss of proprioception/vibration/touch from T6 down

27
Q

lesion of dorsolateral fasciculus at T4

A

ipsilateral loss of pain & temperature from T4,5,6

28
Q

lesion of nucleus proprius at T8

A

ipsilateral loss of pain & temperature at T10

29
Q

lesion of ventral white commissure at T8

A

bilateral loss of pain & temperature at T10

30
Q

lesion of lateral spinothalamic tract at T8

A

contralateral loss of pain & temperature from T10 down

31
Q

lesion of spinocerebellar tracts

A

ataxia

32
Q

lesion of ventral corticospinal tracts

A

Contralateral core weakness

33
Q

lesion of lateral corticospinal tracts

A

ipsilateral spastic paralysis (distal flexors) from level of lesion down

34
Q

lesion of ventral root

A

flaccid paralysis

35
Q

lesion of corticospinal tracts

A

contralateral spastic paralysis

36
Q

lesion of spinal tract (nucleus) of trigeminal

A

ipsilateral loss of P+T from face

37
Q

lesion of chief sensory nucleus of trigeminal

A

ipsilateral loss of touch from face

38
Q

lesion of mesencephalic nucleus of trigeminal

A

ipsilateral loss of proprioception from face

39
Q

lesion of motor nucleus of trigeminal

A

paralysis of mastication muscles (jaw deviation to side of lesion)

40
Q

lesion of trigeminal lemniscus below mid pons

A

contralateral loss of P+T from face

41
Q

lesion of trigeminal lemniscus above mid pons

A

contralateral loss of P+T, touch, proprioception from face

42
Q

lesion of CN V

A
  • ipsilateral anesthesia of face (loss of P+T, touch, proprioception)
  • inability to bite down (mastication)
  • sometimes causes trigeminal neuralgia (lose all but pain)
43
Q

lesion of subthalamus

A

hemiballismus: uncontrollable, violent torsonal movements

NYCC Neuro 1 (20 decks)

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