Ascending Systems 2 Flashcards

(28 cards)

1
Q

sensory first order neuron location

A

peripheral process and DRG in PNS

central process enters cord

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2
Q

sensory first order synapse location

A

cord or brainstem

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3
Q

sensory second order neuron synapse

A

ventral posterolateral thalamus

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4
Q

sensory third order neuron synapse

A

cortex

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5
Q

location of sensory decussation

A

at the gracilis or cuneate nuclei

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6
Q

DCML does

A

discriminatory touch
position
vibration

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7
Q

location of second order synapse above T6

A

cuneate fasiculus

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8
Q

location of second order synapse below T6

A

gracilis fasiculus

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9
Q

in what do the fibers decusate

A

internal arcuate fibers

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10
Q

what forms medial lemniscus

A

internal arcuate fibers from the gracilis/cuneate nuclei

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11
Q

in what do fibers travel from the VPL to the cortex

A

posterior limb of the internal capsule

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12
Q

what is the post synaptic dorsal column system

A

alternate route of DCML information- fibers synapse immediately upon entering cord
for pain sensation

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13
Q

medial division of the dorsal root entry zone

A

large heavily myelinated fibers

synapse at laminae III-V

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14
Q

lateral division of the dorsal root entry zone

A

small axons with little to no myelination

join Lissauer’s tract

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15
Q

somatotrophic arrangement of medial lemniscus

A

legs are most anterior
trunk
arms more posterior

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16
Q

DCML blood supply

A

posterior spinal arteries

17
Q

defect of peripheral nerve damage

A

loss of all modalities in the nerve field distribution

18
Q

defect of dorsal root damage

A

loss of all modalities in the dermatome distribution

19
Q

defect in the CNS

A

depends on the lesion location as to what side affected and severity

20
Q

modality

A

type of sensation

21
Q

topography

22
Q

level of sensation

23
Q

DCML defect results in

A

full loss of vibratory sensation

partial loss of everything else (covered by other systems)

24
Q

romberg sign

A

difficult standing with eyes close

25
common cause of ataxia
loss of proprioception in feet
26
Frederich's ataxia
autosomal reessive mutation affecting the DCML
27
tabes dorsalis
associated with late stage neurosyphallis
28
ataxia
lack of muscle movement coordination