Sensory systems I Flashcards

1
Q

the DC-ML pathway relays what modalities?

A

crude and discriminative touch, stereognosis, flutter-vibratory, general proprioception

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2
Q

what type of fibers make up the first order neuron in the DC-ML pathway?

A

large diameter, heavily myelinated Aa and AB fibers

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3
Q

where is the cell body for first order neurons of the DC-ML pathway?

A

DRG

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4
Q

Where is the FC present? FG?

A
  1. FC = C1-T6 2. FG = all spinal cord levels
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5
Q

where is the cell body of the second order neuron in the DC-ML pathway located?

A

NG or NC

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6
Q

what is the sensory decussation of the DC-ML pathway?

A

crossing of the internal arcuate fibers (axons from second order neurons) across the midline to form the medial lemniscus

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7
Q

what forms the medial lemniscus?

A

gathering of the internal arcuate fibers (axons of second order neurons)

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8
Q

where does the medial lemniscus go?

A

ascends to ventral posterior lateral (VPL) nucleus of the thalamus to synapse with third order neurons

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9
Q

where is the cell body of the third order neuron of the DC-ML pathway located?

A

VPL nucleus of the thalamus

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10
Q

where do the axons of the third order neurons go?

A

exit thalamus and ascend through the posterior limb of he internal capsule to terminate in the postcentral gyrus (Brodman’s areas 3, 1, 2, 3a, 3b)primary somatosensory cortex (parietal lobe)

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11
Q

when is sensory information consciously perceived?

A

when it enters the primary somatosensory cortex

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12
Q

where does information go after entering the primary somatosensory cortex?

A

sensory association cortex

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13
Q

what is Rhomberg’s sign?

A

loss or impairment of conscious proprioception, difficulty maintaining balance when eyes are closed and standing with feet close together

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14
Q

tabes dorsalis (neurosyphilis) is characterized by what signs?

A
  1. damage to DRGs or large diameter heavily myelinated axons in dorsal columns 2. sensory ataxia 3. Rhomberg’s sign
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15
Q

what artery supplies the medial surface of the parietal lobe LL area?

A

anterior cerebral

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16
Q

what artery supplies the postcentral gyrus of the parietal lobe trunk, UL area?

A

middle cerebral

17
Q

what artery supplies the posterior limb of the internal capsule?

A

lenticulostriate arteries (branches of middle cerebral)

18
Q

what artery supplies the thalamus?

A

thalamogeniculate arteries (branches of posterior cerebral)

19
Q

what artery supplies the midbrain?

A

posterior cerebral

20
Q

what artery supplies the pons?

A

branches of basilar / AICA

21
Q

what artery supplies the rostral medulla?

A

vertebral artery / anterior spinal

22
Q

what artery supplies the caudal medulla?

A

anterior spinal (ML) and posterior spinal (NG, NC)

23
Q

what artery supplies the cervical spinal cord?

A

posterior spinal (DC)

24
Q

what are the tracts of the ascending cerebellar pathway?

A
  1. cuneocerebellar 2. rostral spinocerebellar 3. dorsal spinocerebellar 4. ventral spinocerebellar
25
Q

which tracts of the ascending cerebellar pathway relay information from the upper limb and trunk? lower limb and trunk?

A
  1. cuneocerebellar - UL and upper trunk 2. rostral spinocerebellar - UL 3. dorsal spinocerebellar - trunk and LL 4. ventral spinocerebellar - lower trunk and LL