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Neuroscience II > Somatosensory Tracts > Flashcards

Somatosensory Tracts Flashcards

complete through dorsal column need to do spinothalmic and spinocerebellum

1
Q

Ascending sensory systems are usually a ___ neuronal chain.

A

3

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2
Q

1st order neuron is in:

A

DRG or in C.N. ganglion

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3
Q

2nd order neuron cell body is in:

A

CNS

and it crosses the midline!

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4
Q

3rd order neuron cell body is usually in:

A

thalamus

and it projects to cortex!

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5
Q

The “conscious” sensation division includes which system(s)?

A

dorsal column

spinothalmic

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6
Q

The “unconscious” sensation division includes which system(s)?

A

spinocerebellum (unconscious proprioception)

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7
Q

Describe dorsal column system:

A 
MORE DISCRIMINATING: 
touch
pressure
vibration
proprioception
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8
Q

Describe spinothalmic system:

A

LESS DISCRIMINATING
pain
temp
crude touch

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9
Q

The dorsal column system conveys information characterized by a high agree of:

A

spatial and temporal resolution

this is what makes it discriminating

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10
Q

Describe general qualities of dorsal column system receptors:

A

high density of receptors

small receptor fields

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11
Q

Describe dorsal column system modalities:

A 
tactile discrimination
vibration
deep touch (pressure)
2-pt discrimination
conscious proprioception (position sense)
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12
Q

List the receptors of the dorsal column system:

A

hair follicle receptors
pacinian corpusles
meissner’s corpuscles
GTO, joint receptors, muscle spindles

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13
Q

Where do 1st order neurons in dorsal column system enter?

A

fibers enter dorsal root

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14
Q

How do 1st order neurons in dorsal column system ascend after entering?

A

ascend via fascicles cuneatus and gracilis without synapsing in SC

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15
Q

How do fibers from lower trunk and LE (1st order neurons in dorsal column system) ascend?

A

in fasciulus gracilis

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16
Q

What happens with fibers from upper trunk and UE (1st order neurons in dorsal column system)?

A

form the fascicles cuneatus

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17
Q

2nd order neuron cell body in dorsal column system is located in the:

A

nucleus cuneatus: upper trunk and UE

gracilis: lower trunk and LE

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18
Q

2nd order neuron cell body in dorsal column system synapse and cross (decussate) in the:

A

caudal medulla

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19
Q

2nd order neuron cell body in dorsal column system ascend through brainstem as:

A

medial lemniscus (somatotopically organized)

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20
Q

3rd order neuron cell body in dorsal column system located in:

A

ventral posterior lateral (VPL) nucleus of thalamus

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21
Q

3rd order neuron cell body in dorsal column system synapse in ______ and then ascend to what destination in somatosensory cortex?

A

VPL nucleus of thalamus

post-central gyrus, area 3,1,2

22
Q

With damage to dorsal columns, what is the implication?

A
  1. impairment but not abolition of tactile sensation
  2. impaired proprioception, vibration, discriminative touch
  3. sensory ataxia may result
23
Q

What type of injury can damage dorsal columns?

A

severe flexion injuries - they may damage posterior spinal arteries which in turn cause damage to dorsal columns

24
Q

What are the receptors involved in spinothalmic system?

A

free nerve endings (pain)
mechanoreceptors, thermoreceptors, chemoreceptors
nocicpetion

25
Q

What modalities does spinothalmic system conduct?

A

pain and temperature

nondiscriminative touch

26
Q

Where is cell body of 1st order neuron of the spinothalmic tract?

A

cell bodies in DRG

27
Q

Describe the central process of 1st order neuron of the spinothalmic tract?

A

central process ascend/descend 2-3 segments in LISSAUER’S TRACT then enter dorsal horn

28
Q

2nd order neuron of spinothalmic system cell bodies located in:

A

delta fibers: lamina I or lamina V

C fibers: intermediate grey or dorsal horn

29
Q

Describe pathway of C fibers - of spinothalmic system:

A

take an indirect course

form a polysynaptic pathway through reticular formation known as spinoreticular fibers

30
Q

Where does decussation occur for spinothalmic system?

A

both delta and C fibers decussate in anterior grey matter in SC

31
Q

After decussation, spinothalmic 2nd oder neurons form what tract?

A

contralateral spinothalmic tract

- in anterior half of lateral funiculus

32
Q

What is decussation?

A

crossing the midline

33
Q

Cell bodies of 3rd order neuron in spinothalmic system are located in

A

VPL nucleus OR intralaminar nuclei

34
Q

Describe the cell bodies of 3rd order neuron in spinothalmic system located in VPL:

A

fibers from lamina I and V
“fast” pain (A delta fibers)
Well localized, sharper, epicritic pain

35
Q

Describe the cell bodies of 3rd order neuron in spinothalmic system located in intralaminar nuclei:

A

spinoreticular fibers
“slow” pain (C fibers)
poorly localized, dull aching, protopathic chain

36
Q

VPL 3rd order neuron destination in spinothalmic system:

A

to somatosensory cortex

postcentral gyrus, area 3, 1, 2

37
Q

Intralaminar nuclei 3rd order neuron destination in spinothalmic system:

A

to widespread areas of cortex

38
Q

Evaluation of sensory system from periphery to sensory cortex is known as

A

somatosensory evoked potentials

39
Q

somatosensory evoked potentials process:

A

stimulation distally on limb
recording on scalp
series of wave forms produced correspond to structures/synapses along sensory tracts

40
Q

What modalities does unconsious proprioception to cerebellum conduct?

A

joint position

proprioception

41
Q

What receptors are involved in unconsious proprioception to cerebellum?

A

GTO
muscle spindle
joint mechanoreceptors

42
Q

Generally, unconsious proprioception to cerebellum system 1st order neuron is in:

A

DRG

43
Q

Generally, unconsious proprioception to cerebellum system 2nd order neuron is in:

A

dorsal horn

44
Q

What specific tracts are in the unconscious proprioception to cerebellum system?

A

dorsal spinocerebellar tract
ventral spinocerebellar tract
cuneocerebellar tract

45
Q

Cerebellar trats project to?

A

ipsilateral Cb

46
Q

Lesions of cerebellum produce?

A

ipsilateral deficits

47
Q

Damage to spinothalmic tract results in:

A

contralateral loss pain and temperature

48
Q

Why does most tactile sensation remain with spinothalmic lesion?

A

due to overlap in function with dorsal column system

49
Q

Which modalities are specific to spinothalmic system?

A

ITCH and TICKLE

they are lost with damage to spinothalmic tract (no overlap with dorsal column like other tactile sensation)

50
Q

What is thalamic pain syndrome?

A

chronic pain syndrome caused by dysfxn of thalamus

often as a result of CVA effecting posterior cerebral artery

Neuroscience II (13 decks)

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