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Med Neur 2 > Dorsal Column Medial Lemniscus > Flashcards

Dorsal Column Medial Lemniscus Flashcards

1
Q

The pathway that lets you feel things

A

Dorsal Column/medial lemniscus

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2
Q

identifying object based on shape/texture

A

Sterognosis

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3
Q

drawing of number/letter on palm and all receptors are involved

A

graphesthesia

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4
Q

Trasmists sensation of light touch, pressure, vibration, proprioceptoin

A

Dorsal column/medial lemniscus

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5
Q

1st neuron of DC/ML is in

A

sensory ganglion w/ cell body in DRG

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6
Q

2nd neouron of DC/ML is in

A

sp cd or brainstem– will cross midline here and asencnd to thalamus

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7
Q

where does the DC/ML cross the midline

A

in the caudal medella

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8
Q

location of 3rd neuron in DC/ML

A

thalamus

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9
Q

Function of first neuron

A

peripheral process trasmits info from mechano–> Cell body in DRG

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10
Q

When central process leave DRG is ascends _______ with the dorsal columns

A

IPSILATERALLY

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11
Q

Where does the 1st neuron end?

A

terminates in dorsal column nuclie

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12
Q

2nd neuron cell body located

A

nucleas gracilic or nucleus cuneatus

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13
Q

Where does axon decussation occur for DC/ML

A

goes to contralateral side after synapsing on F.gracilis or cuneatus

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14
Q

After decussation on Fgracilis or F. cuneatous, axon ascends….

A

as the Medial Lemniscus

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15
Q

Level of brain the 2nd neuron axon synapses at

A

cuadal medulla on the F. cuneatus or F. Gracilis

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16
Q

F.Gracilis if for

A

pahtways form lower body

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17
Q

F. Cuneatus is for

A

pathways from upper body

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18
Q

Where does the 2nd neuron terminate

A

In the Ventral posterior lateral nucleus or VPL in the thalamus

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19
Q

where is the VPL located

A

thalamus

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20
Q

Where is the cell body of 3rd neuron

A

Cell body in the VPL of thalamus

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21
Q

Where do the axons pass through after then synapse on VPL

A

axons pass through posterior limb of internal capsule

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22
Q

Where does the 3rd neuron terminate

A

in the SI cortex (poscentral gyrus, primary somatosensory cortex

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23
Q

a cluster of NCB with lots of dif nuclei with lots of dif names

A

thalamus

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24
Q

Dorsal colum with axons below T7

A

fasiculus gracilis

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25
Q

Dorsal column with axons above T7

A

F. cuneatus

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26
Q

What gets added on latter, F. gracilis or cuneatus

A

F. cuneatus bc has from upper body

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27
Q

1st neuron: from sp cd to caudal medulla, where are the sacral dermatomes located

A

medially

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28
Q

lumbar, thoracic, cerical dermatomes are located progressively more ______ as we ascend from sp cd to caudal medulla

A

laterally

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29
Q

CC: unilateral sp cd lesion causes loss of what functions

A

light touch, pressure, vibration and proprioception on SAME SIDE of lesion from derms below level of lesion
as well as loss of other seosry and motor fnx

30
Q

lesion here results in loss of lt, pressure, vb from derms below level of lesion on same side as well as loss of other sensory and motor function

A

unilateral (one side) spinal cord lesion

31
Q

lesion on the left side of spinal cord in sacral region results in

A

loss of all touch, sensation, vibration and proproception and motor function on SAME SIDE of lesion

32
Q

Bilateral sp cd lesion results in

A

loss of lt, pressure, vb from dermatomes just below level of lesion and loss of other sensory and motor

33
Q

loss of light touch, pressure, vibration and proprioception from derms below level of lesion while other sensory and motor funx intact

A

Posterior cord syndome

34
Q

Posterior cord sydrome results in:

A

loss of lt touch, pressure, vibration from derms below lesion while other sensory and motor functions are intact.

35
Q

loss of lt, pressure, vb from dermatomes just below level of lesion and loss of other sensory and motor
(on both sides)

A

bilateral cord lesion or transecion

36
Q

Large central cord syndrome

A

a. loss of light touch/pressure/ vibration/proprioception from derms below level of lesion
b. Sacral region may be spared because these guys head more lateral higher up we get
c. loss of sensory and motor fnx

37
Q

a. loss of light touch/pressure/ vibration/proprioception from derms below level of lesion
b. Sacral region may be spared because these guys head more lateral higher up we get
c. loss of sensory and motor fnx

A

Large central cord syndrome

38
Q

get sparing of sacral region, everything else below lesion is fucked

A

Large central cord syndrome

39
Q

cell bodies in caudal medulla: F. gracilis or F. cunateus

A

2nd neuron

40
Q

Axons decussate here as interal arcuate fibers

A

2nd neuron

41
Q

After 2nd neurons decussate, they from axons called

A

medial lemniscus

42
Q

Axons of medial lemniscus travel from ______ through these regions

A

caudal medulla

rostral medulla, pons and midbrain

43
Q

Where does the medial lemniscus terminate in

A

VPL

44
Q

At rostroal medullas, somatotopy

A

headless hemiman standing on pyramids

45
Q

At level of pons, somatotopy

A

fibers from face added via trigeminal

and from lateral–center: SLTC

46
Q

At the rostral medulla, what happens to sacral fibers

A

become more ventral

47
Q

When can we add somatotopy of head

A

midpons or above

48
Q

Lesion of Medial Lemniscus results in:

A

loss of lt touch/pressure/vibration from dermatomes BELOW level and on CONTRALATERAL side

49
Q

loss of lt touch/pressure/vibration from dermatomes BELOW level and on CONTRALATERAL side

A

Lesion of Medial Lemniscus or Medial medullary syndrome

50
Q

Thalamas has
VPL: for sensations from
VPM for sensations from

A

body

face

51
Q

Somatotopy of Thalamus

A

add fibers from face in VPM anlong with VPL

face more medial==> legs more lateral in the thalamus

52
Q

Where do the axons of the third neuron pass through

A

posterior limb of internal capsule

53
Q

Axons from thalamus fan out in something called

A

corona radiata

54
Q

Fibers from VPL and VPM head to

A

SI cortex

55
Q

SI cortex somatotopy

A

think about face being big and outside laterally, while toward the central sulcus we have the legs and arms

56
Q

Lesion of thalamus or SI cortex result in

A

loss of sensation from contralateral half of body

57
Q

loss of sensation on right half of face, right half of body d/t

A

lesion in the contraleral half of thalmus or SI cortex

58
Q

Area 3a for

A

limb movement

59
Q

Area 3b for

A

basic tactile info, edges and texture

60
Q

Area 1 for

A

motion and direction of movment of object

61
Q

Area 2 for

A

limb position, shape of objects

62
Q

SI neurons project to

A

SII cortex along upper border of sylvian fissure and insular cortex

63
Q

where is SII cortex at

A

along upper border of sylvnain fissure and insular cortex

64
Q

Where are Parieatal Association cortices located

A

intrapariatal sulcus

65
Q

What do parietal association cortices do

A

recieve senosory info and project it to motor cortex

66
Q

parietal association cortices are both:

A

unimodal and multimodal

67
Q

lesion in unimodal part of Parietal Association cortices results in

A

agnosias (cant reconginze an object or property of object

68
Q

Lesion here results in contralateral neglect

A

in Multimodal part of Parietal Association cortex

69
Q

Region responsible for combining sensation with motivation, attention and relevance

A

Multimodal part of Parietal association cortex

70
Q

Region for visual, auditory and somatorsensory input from SI or SII

A

Unimodal Parietal association Cortex

Med Neur 2 (12 decks)

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