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

B7-0016 Spinal Cord and Long Pathways Flashcards

(67 cards)

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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
1st synapse of the dorsal column
nucleus gracilis (legs) nucleus cuneatus (arms) in ipsilateral medulla
26
2nd synapse of the dorsal column
VPL in thalamus
27
the 3rd order neuron of the dorsal column projects to
primary somatosensory cortex
28
tract that senses pain, temperature
spinothalamic
29
1st synapse of the spinothalamic tract
posterior horn (spinal cord)
30
2nd synapse of the spinothalamic tract
VPL (thalamus)
31
the 3rd order neuron of the spinothalamic tract projects to
primary somatosensory cortex
32
where does the dorsal column decussate?
in the medulla, then second order neuron ascends contralaterally as the medial lemniscus
33
where does the spinothalamic tract decussate?
in spinal cord as the anterior white commisure
34
composed of large-diameter, myelinated fibers that are rapidly conducting
DC/ML
35
composed of small diameter myelinated and unmyelinated fibers slowly conducting
spinothalamic
36
1st order neuron of the dorsal column
sensory nerve ending in dorsal root ganglion enters spinal cord, ascends ipsilaterally
37
1st order neuron of spinothalamic tract
sensory nerve ending composed of A-delta and C fibers in the dorsal root ganglion.--> enters spinal cord
38
deficits to the spinothalamic tract in the spinal cord will involve [...] body surface [...] the level of the lesion
contralateral below
39
the components of the sympathetic nervous system reside in the [...] cord
thoracic (injury below T10ish should not damage sympathetic pathway)
40
postcentral gyrus contains [...] information
sensory **primary somatosensory cortex**
41
sensory pathways are [afferent/efferent]
afferent (toward CNS)
42
fibers in the dorsal column carry [...] information
sensory
43
loss of touch and proprioception indicates damage to which pathway
DC/ML
44
damage to the medial lemniscus would result in
sensory loss from the neck down (contains sensory axons from all levels of the spinal cord)
45
the [...] cord has the most white and gray matter
cervical
46
the [...] cord has the least white and gray matter
sacral
47
the [...] cord is characterized by weenie dorsal and ventral horns
thoracic cord
48
the [...] cord has less white matter than cervical with equally large dorsal and ventral horns
lumbar
49
when, on a given part of the body, sensation is lost for one modality and retained for the other
dissociated loss
50
loss of touch/vibration, but retention of pain and temperature is an example of
dissociated loss loss of DC/ML pathway, retention of spinothalamic
51
damage to the cortex constitutes an [...] motor neuron lesion
upper
52
ventrolateral white matter contains axons in which pathway
spinothalamic
53
carry pain and temperature information from the contralateral body surface
spinothalamic
54
information in the pain pathway decussates in the [...] so white matter axons in the cord represent the [...] side
spinal cord contralateral (spinothalamic tract)
55
because the spinothalamic is an ascending tract, the loss will occur
regions below the level of deficit
56
how are dorsal columns organized?
arms outside (lateral) legs inside (medial)
57
how are the corticospinal and spinothalamic tracts organized?
legs lateral arms medial
58
descending tract
corticospinal
59
ascending tracts
dosal column spinothalamic
60
controls voluntary motor movements
corticospinal
61
senses pressure, vibration, fine touch
dorsal column
62
senses pressure, vibration, fine touch in lower extremity
fasciculus gracilius of DC/ML (medial)
63
senses pressure, vibration, fine touch in upper extremity
fasciculus cuneatus of DC/ML (lateral)
64
senses crude touch and pressure
anterior spinothalamic tract
65
senses pain, temperature
lateral spinothalamic tract
66
[...] and [...] synapse, then cross
spinothalamic and dorsal column
67
[...] crosses, then synapses
corticospinal tract

BMB Test 1 (17 decks)

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