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BMB Test 1 > B7-0016 Spinal Cord and Long Pathways > Flashcards

B7-0016 Spinal Cord and Long Pathways Flashcards

1
Q

group of neuronal cell bodies outside CNS

A

ganglion

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2
Q

group of neuronal cell bodies inside CNS

A

nucleus

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3
Q

bundle of axons in CNS

A

tract

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4
Q

send an axon to synapse on neurons in another structure

A

project to

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5
Q

synapse in/on

A

terminate

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6
Q

cross from one side of the brain to another

A

decussate

(ipsilateral or contralateral)

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7
Q

contributes to regional specialization

A

somatotopy

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8
Q

motor neuron pools reside in the […] laminae

A

ventral

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9
Q

dorsal laminae primarily receive […] information

A

sensory

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10
Q

label the tracts

A
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11
Q

voluntary motor pathway

A

corticospinal tract

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12
Q

upper motor neuron of the corticospinal tract

A

cortical motoneuron

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13
Q

lower motor neuron of the corticospinal tract

A

alpha motoneuron

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14
Q

where does the corticospinal tract dessucate?

A

caudal end of medulla (pyramidal decussation)

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15
Q

flaccid paralysis indicates […] motor neuron damage in the corticospinal tract

A

lower

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16
Q

spastic paralysis indicates […] motor neuron damage in the corticospinal tract

A

upper

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17
Q

a lesion rostral to the decussation will cause deficits […] to the lesion

A

contralateral

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18
Q

a lesion caudal to the decussation will cause deficits […] to the lesion

A

ipsilateral

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19
Q

the corticospinal tract begins at the […], descends ipsilateral and decussates at the […], then descends contralaterally

A

motor cortex
pyramidal decussation

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20
Q

1st synapse of the corticospinal tract

A

anterior horn (spinal cord)

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21
Q

1st order neuron of the corticospinal tract

A

UMN (motor cortex)

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22
Q

2nd order neuron of the corticospinal tract

A

LMN (leaves spinal cord)

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23
Q

2nd synapse of corticospinal tract

A

NMJ at skeletal muscle

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24
Q

tract that senses pressure, vibration, fine touch, proprioception

A

dorsal column

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25
Q

1st synapse of the dorsal column

A

nucleus gracilis (legs)
nucleus cuneatus (arms)

in ipsilateral medulla

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26
Q

2nd synapse of the dorsal column

A

VPL in thalamus

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27
Q

the 3rd order neuron of the dorsal column projects to

A

primary somatosensory cortex

28
Q

tract that senses pain, temperature

A

spinothalamic

29
Q

1st synapse of the spinothalamic tract

A

posterior horn (spinal cord)

30
Q

2nd synapse of the spinothalamic tract

A

VPL (thalamus)

31
Q

the 3rd order neuron of the spinothalamic tract projects to

A

primary somatosensory cortex

32
Q

where does the dorsal column decussate?

A

in the medulla, then second order neuron ascends contralaterally as the medial lemniscus

33
Q

where does the spinothalamic tract decussate?

A

in spinal cord as the anterior white commisure

34
Q

composed of large-diameter, myelinated fibers that are rapidly conducting

35
Q

composed of small diameter myelinated and unmyelinated fibers
slowly conducting

A

spinothalamic

36
Q

1st order neuron of the dorsal column

A

sensory nerve ending in dorsal root ganglion

enters spinal cord, ascends ipsilaterally

37
Q

1st order neuron of spinothalamic tract

A

sensory nerve ending composed of A-delta and C fibers in the dorsal root ganglion.–> enters spinal cord

38
Q

deficits to the spinothalamic tract in the spinal cord will involve […] body surface […] the level of the lesion

A

contralateral
below

39
Q

the components of the sympathetic nervous system reside in the […] cord

A

thoracic

(injury below T10ish should not damage sympathetic pathway)

40
Q

postcentral gyrus contains […] information

A

sensory

primary somatosensory cortex

41
Q

sensory pathways are [afferent/efferent]

A

afferent

(toward CNS)

42
Q

fibers in the dorsal column carry […] information

43
Q

loss of touch and proprioception indicates damage to which pathway

44
Q

damage to the medial lemniscus would result in

A

sensory loss from the neck down

(contains sensory axons from all levels of the spinal cord)

45
Q

the […] cord has the most white and gray matter

46
Q

the […] cord has the least white and gray matter

47
Q

the […] cord is characterized by weenie dorsal and ventral horns

A

thoracic cord

48
Q

the […] cord has less white matter than cervical with equally large dorsal and ventral horns

49
Q

when, on a given part of the body, sensation is lost for one modality and retained for the other

A

dissociated loss

50
Q

loss of touch/vibration, but retention of pain and temperature is an example of

A

dissociated loss

loss of DC/ML pathway, retention of spinothalamic

51
Q

damage to the cortex constitutes an […] motor neuron lesion

52
Q

ventrolateral white matter contains axons in which pathway

A

spinothalamic

53
Q

carry pain and temperature information from the contralateral body surface

A

spinothalamic

54
Q

information in the pain pathway decussates in the […] so white matter axons in the cord represent the […] side

A

spinal cord
contralateral

(spinothalamic tract)

55
Q

because the spinothalamic is an ascending tract, the loss will occur

A

regions below the level of deficit

56
Q

how are dorsal columns organized?

A

arms outside (lateral)
legs inside (medial)

57
Q

how are the corticospinal and spinothalamic tracts organized?

A

legs lateral
arms medial

58
Q

descending tract

A

corticospinal

59
Q

ascending tracts

A

dosal column
spinothalamic

60
Q

controls voluntary motor movements

A

corticospinal

61
Q

senses pressure, vibration, fine touch

A

dorsal column

62
Q

senses pressure, vibration, fine touch in lower extremity

A

fasciculus gracilius of DC/ML (medial)

63
Q

senses pressure, vibration, fine touch in upper extremity

A

fasciculus cuneatus of DC/ML (lateral)

64
Q

senses crude touch and pressure

A

anterior spinothalamic tract

65
Q

senses pain, temperature

A

lateral spinothalamic tract

66
Q

[…] and […] synapse, then cross

A

spinothalamic and dorsal column

67
Q

[…] crosses, then synapses

A

corticospinal tract

BMB Test 1 (17 decks)

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