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IB 703 > somatosensory pathways > Flashcards

somatosensory pathways Flashcards

1
Q

dermatome

A

territory innervated by each spinal nerve or innervated by axons of a single dorsal root

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2
Q

most extensive dermatome overlap

A

touch, pressure, and vibration

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3
Q

less significant dermatome overlap

A

pain and temperature

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4
Q

arrangement of proprioceptors?

A

no segmental arrangement of proprioceptors

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5
Q

the dorsal column-medial lemniscal system conveys what kind of information

A

tactile information

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6
Q

cell bodies of 1st order neurons in dorsal column-medial lemniscal system

A

dorsal root ganglia

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7
Q

cell bodies of 2nd order neurons in dorsal column-medial lemniscal system

A

nucleus gracilis & nucleus cuneatus

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8
Q

cell bodies of 3rd order neurons in dorsal column-medial lemniscal system

A

thalamus

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9
Q

site of decussation in dorsal column-medial lemniscal system

A

second order axons

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10
Q

pathway conveying proprioception

A

central pathways

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11
Q

cell bodies of 1st order neurons conveying proprioception

A

dorsal root ganglia

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12
Q

cell bodies of 2nd order neurons conveying proprioception

A

clark’s nucleus, in the spinal cord (T1-L2)

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13
Q

cell bodies of 3rd order neurons conveying proprioception

A

cerebellum

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14
Q

site of decussation in central proprioception pathways

A

ummm idk

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15
Q

proprioceptive info can be transferred where else besides the cerebellum?
by what pathway?

A

cerebral cortex

pathway: identical to tactile information pathway

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16
Q

what does the anterolateral system (ALS) convey

A

free nerve endings: pain, temperature, itch, crude touch

17
Q

cell bodies of 1st order neurons of ALS

A

dorsal root ganglia

18
Q

cell bodies of 2nd order neurons of ALS

A

gray matter of dorsal horn of SC

rexed’s laminae I and V

19
Q

cell bodies of 3rd order neurons of ALS

A

thalamus

20
Q

lissauer’s tract

A

(dorsolateral tract of lissauer)

  • in ALS
  • axons branching into ascending & descending collaterals
  • run up & down for 1-2 spinal cord segments
21
Q

site of decussation in ALS

A

ventral/anterior white commissure

22
Q

ALS thalamus input

A

reticular formation & spinothalamic and spinoreticular tracts

IB 703 (10 decks)

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