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NSB Biweekly 1 > Pavlick- Somatosensory Pathways > Flashcards

Pavlick- Somatosensory Pathways Flashcards

1
Q

Afferent information transmitted by peripheral receptors

A

somatosensation

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2
Q

where is somatosensory cortex

A

post-central gyrus

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3
Q

1st order neuron cell body is where

A

dorsal root ganglion

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4
Q

2nd order neurons found where

A

dorsal horn of spinal cord

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5
Q

what neurons will decussate

A

2nd order

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6
Q

3rd order neurons found where

A

thalamus (and travel to sensory cortex)

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7
Q

______ order neuron that conveys environmental stimulus
Cell body lies in dorsal root ganglion

A

first order

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8
Q

peripheral sensory receptor that senses vibration

A

pacinian corpuscle (looks like cut onion on histology)

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9
Q

peripheral sensory receptor that senses skin stretch

A

Ruffini ending

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10
Q

peripheral sensory receptor that senses nociception

A

free nerve ending

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11
Q

peripheral sensory receptor that senses movement across skin (slippage)

A

Meissner’s corpuscle

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12
Q

peripheral sensory receptor that senses light pressure, edges (reading brail)

A

Merkel disc

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13
Q

peripheral sensory receptor that senses tension

A

golgi tendon organ

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14
Q

peripheral sensory receptor that senses changes in muscle length and rate of length change

A

muscle spindle

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15
Q

this somatosensory pathway focuses on proprioception, vibration, and 2-point discrimination

A

Dorsal Column Medial Lemniscus

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16
Q

this somatosensory pathway focuses on, temperature, nociception, crude touch

A

Anterolateral system (spinothalamic)

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17
Q

this somatosensory pathway focuses on unconscious proprioception and balance

A

spinocerebellar

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18
Q

stimulus from tissue damage that the brain may interpret as pain

A

nociception

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19
Q

first order neuron in DCML pathway that senses discriminative touch, vibration, and proprioception

A

dorsal column

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20
Q

second motor neuron in DCML that ascend and synapse in thalamus (VPL)

A

medial lemniscus

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21
Q

3rd order neurons synapse where

A

synapse in primary sensory cortex (parietal lobe) and project to 4th order neurons

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22
Q

2nd order neurons ascend to thalamus how

A

ipsilaterally

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23
Q

above T6, first order neurons ascend and synapse where

A

at cuneate fasciculus of dorsal horn

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24
Q

below T6, first order neurons ascend and synapse where

A

gracile fasciculus in dorsal horn

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25
Q

below T6, DCML sensory info for a lot of the _______extremities

A

lower

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26
Q

_____ fasciculus deals with upper extremity sensations

A

cuneate

27
Q

1st order neurons synapse on 2nd order neurons in

A

dorsal horn

28
Q

decussate and ascend contralaterally as medial lemniscus and synapse on 3rd order neurons in VPL of thalamus

A

2nd order neurons

29
Q

incomplete spinal cord injury affecting the dorsal columns

A

posterior cord syndrome

30
Q

main causes of this include: B12 deficiency and neurosyphilis (tabes dorsalis)

A

posterior cord syndrome

31
Q

sensory ataxia due to decreased proprioceptive input
Decreased sensation of vibration and fine touch

A

posterior cord syndrome

32
Q

Posterior cord syndrome as a result of neurosyphilis

A

tabes dorsalis

33
Q

Responsible for transmitting proprioceptive information (unconscious)

A

Spinocerebellar pathway

34
Q

1st order neuron in DRG enter dorsal horn of spinal cord and synapse onto 2nd order neurons in _________ (spinocerebellar tract)

A

nucleus dorsalis

35
Q

2nd order neurons ascend to enter cerebellum through ______ (spinocerebellar tract)

A

cerebellar peduncles

36
Q

Responsible for transmitting nociception, temperature, and crude touch, pressure

A

spinothalamic tracts

37
Q

1st order neurons in DRG enter dorsal horn of spinal cord, synapses with 2nd order neuron in ______ (spinothalamic tract)

A

substantia gelatinosa

38
Q

Decussates within 1-2 levels through _______ to ascend contralaterally (spinothalamic tracts)

A

anterior white commissure

39
Q

2nd order neurons synapse on 3rd order neurons in __________ of thalamus (spinothalamic)

A

VPL

40
Q

3rd order neurons projects to 4th order neurons in ________ (spinothalamic)

A

primary sensory cortex

41
Q

Fluid-filled cyst forms within central canal and compromises anterior white commissure

A

Syringomyelia (central cord syndrome)

42
Q

“cape_” distribution of sensory loss

A

central cord syndrome

43
Q

What is in anterior white commissure?

A

axons of spinothalamic tract

44
Q

Lesion above motor decussation will present with motor deficits _______ to lesion

A

contralateral

45
Q

lesion below decussation will present with deficits _________________ to lesion

A

ipsilateral

46
Q

lesion above sensory decussation will result in deficit________ to lesion

A

contralateral

47
Q

lesion below sensory decussation will result in deficit________ to lesion

A

ipsilateral

48
Q

blue
red
and what location is this

A

DCML–blue
anterolateral system–red
spinal cord

49
Q

where

A

caudal medulla
decussation of DCML tract

50
Q

what is in the blue
“man standing on the pyramid”

A

medial lemniscus (2nd order neuron of DCML)

51
Q

location

A

medulla

52
Q

“walrus”
blue

A

pons
medial lemniscus

53
Q

where
“sitting frog with mustache”

A

caudal midbrain

54
Q

“upsidedown girl with a fro”

A

rostral midbrain (front of midbrain)

55
Q

when 2nd order neurons (medial lemniscus) synapse where, they become 3rd order

A

VPL of thalamus

56
Q

Midbrain structure which sends descending projections important for pain modulation

A

Periaqueductal Gray

57
Q

Surrounding the cerebral aqueduct
important for pain modulation

A

Periaqueductal Gray

58
Q

As afferent pain signals ascend, collateral axons synapse with PAG to activate release of pain modulating products _________

A

serotonin
NE
endogenous opiate peptides (internal pain killers)

59
Q

where can pain be interrupted (gate theory of pain)

A

substantia gelatinosa of anterior white commissure

60
Q

______can stimulate an interneuron to actually block pain signal from spinothalamic fibers (b/c faster signals than spinothalamic—–due to A-delta and C fibers)

A

DCML fibers

61
Q

pressure from “Livia” attempts to do what for menstrual cramps w/ a different, faster stimulus from separate pathway (DCML)

A

override pain signals (block them)

62
Q
A

f

63
Q

hemisection of spinal cord

A

Brown-Sequard Syndrome

64
Q

loss of contralateral pain/temperature
loss of ipsilateral vibration and/or proprioception below level of lesion
loss of ipsilateral motor function below level of lesion

A

Brown-Sequard Syndrome

NSB Biweekly 1 (15 decks)

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