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Neuro Exam I > Sensory I > Flashcards

Sensory I Flashcards

1
Q

what does the DC-ML pathway relay from the body into consciousness

A

driminative touch
stereognosis
flutter-virbratory sense
general propreation

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2
Q

stereognosis

A

knowing solids

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3
Q

all sensory info carried from DC-ML pathway enters what

A

consciousness

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4
Q

what is the min distance for 2 point discrimination on finger

A

5 mm

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5
Q

what is the min distance for 2 point discrimination on lower limb

A

40 mm

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6
Q

where is 1st order neuron cell body

A

dorsal root ganglia

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7
Q

where is 2nd order neuron cell body

A

NG or NC

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8
Q

where is 3rd order neuron cell body

A

ventral posterior lateral nuclei of thalamus

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9
Q

FG

A

ascending tract from lower limbs

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10
Q

FC

A

ascending tract from upper limbs

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11
Q

dorsal column contains ____ axons

A

ascending

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12
Q

where is FC present

A

C1-T6

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13
Q

where is FG present

A

all spindal cord levels

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14
Q

what is unique about C1

A

only has a ventral root (motor fibers(

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15
Q

peripheral processes

A

get sensory information from limbs and trunk

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16
Q

how to descending tracts change

A

get thinner as they descneding

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17
Q

how do ascending tracts change

A

become thicker as they ascending

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18
Q

1st order neuron

A

pseudounipolar neuron that transmits sensory input from periphery to spinal cord

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19
Q

peripheral process

A

transmit sensory input from UL, UT, LL, LT

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20
Q

Aalpha/Abeta fibers

A

heavily myelinated

allow for quick transmission of sensory information

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21
Q

Aalpha/Abeta fibers

A

heavily myelinated

allow for quick transmission of sensory information

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22
Q

where do central processes of 1st order neuron enter

A

dorsal root of spinal cord, ascend in FG or FC

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23
Q

where do central processes of 1st order neuron synpase/terminate

A

with their respective nuclei (NG or NC) in medulla

24
Q

where do axons of 2nd order neuron course

A

cross midline of caudal meddula

25
Q

medial leminscus

A

formed from crossed axons of 2nd order neurons

ascend brainstem to thalamus

26
Q

where do 2nd order neruons terminate

A

VPL nucleus of thalamus

27
Q

where do axons of 3rd order neurons project

A

to pirmary somatosensory cortex and sensory association cortex

28
Q

primary somatosensory cortex

A

where we become consiously aware of sensory input

29
Q

sensory association cortex

A

where we interpret/identify an object based on previous sensory experiences

30
Q

DC-ML exhibits _____ organization of fibers

A

somatotopic

31
Q

occlusion of one of the posterior spinal a at spinal cord levels results in what

A

damage of the ipsilateral dorsal column pathways

32
Q

unilateral lesion of the dorsal columns at teh spinal cord level results in waht

A

loss or impairment of sensory input from teh ipsilateral side of body AT and BELOW level of lesion

33
Q

occlusion of one of the posterior spinal a in the medulla results in

A

damage of dorsal column pathways and their nuclei

deficits in ipsilateral side

34
Q

lesion damaging NG and NC causes

A

ipsilateral sensory deficient in entire body

35
Q

occlusion of anterior spinal a in medulla results in

A

affects medial leminscus

results in loss of proprioception and vibratory sense from body

36
Q

dorsal columns and their nuclei process ensory info from what side of teh body

A

ipsiliateral

37
Q

the medial leminscus carrys senosry information from ____ side of body

A

contralateral

38
Q

the medial leminscus carrys senosry information from ____ side of body

A

contralateral

39
Q

what does verebral a supply

A

ML in rostral medulla

40
Q

what does basilar a supply

A

ML in caudal pons

41
Q

what does posterior cerebral a supply

A

ML in midbrain

42
Q

what do the lenticulostriate a supply

A

anterior and posterior limbs of internal capsul

43
Q

axons of 3rd order neurons of DC-ML ascend to cortex via what

A

posterior limb of IC

44
Q

occlusion of lenticulostriate a causes what

A

sensory deficentins in contralateral side of body

45
Q

what does anterior cerebral a supply

A

medial surface of frontal and pariteal lobe

46
Q

lesion in medial surface of S-I cortex causes

A

sensory deficits in contralateral lega nd foot

47
Q

lesion of lateral surface of S-I cortex causes

A

sensory deficients in contralateral UL and face

48
Q

what does middle cerebral a supply

A

lateral surface of cerebral hemispher

49
Q

sensory ataxia

A

sensory incoordination

50
Q

rhomber’s sign

A

difficulty maintaining balance with eyes closed, feet clsoe togheter

51
Q

tables dorsalis

A

damage to dorsal roots and DCs
sensory ataxia
rhomberg sign

52
Q

stamp and stick ataxia is caused by

A

lesion of DC-ML pathways

bilateral FG lesion

53
Q

lesion of DC-ML pathways causes

A

loss of proprioception at and below lesion

54
Q

bilateral FG lesion casues

A

loss of proprioception in lower trunk and LL

individual won’t be able to tell what their legs are doring

55
Q

acending pathways that carry nonconscious proprioception from body to ipsilateral cerebellum

A

cunecerebellar tract

dorsal spinocerebral tract

Neuro Exam I (10 decks)

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