Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Neuroscience II > Somatosensory Tracts > Flashcards

Somatosensory Tracts Flashcards

complete through dorsal column need to do spinothalmic and spinocerebellum (50 cards)

Start Studying
1
Q

Ascending sensory systems are usually a ___ neuronal chain.

A

3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

1st order neuron is in:

A

DRG or in C.N. ganglion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

2nd order neuron cell body is in:

A

CNS

and it crosses the midline!

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

3rd order neuron cell body is usually in:

A

thalamus

and it projects to cortex!

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

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

A

dorsal column

spinothalmic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

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

A

spinocerebellum (unconscious proprioception)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Describe dorsal column system:

A 
MORE DISCRIMINATING: 
touch
pressure
vibration
proprioception
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Describe spinothalmic system:

A

LESS DISCRIMINATING
pain
temp
crude touch

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Describe general qualities of dorsal column system receptors:

A

high density of receptors

small receptor fields

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Describe dorsal column system modalities:

A 
tactile discrimination
vibration
deep touch (pressure)
2-pt discrimination
conscious proprioception (position sense)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

List the receptors of the dorsal column system:

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

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

A

fibers enter dorsal root

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

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

A

in fasciulus gracilis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

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

A

form the fascicles cuneatus

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

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

A

caudal medulla

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

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

A

medial lemniscus (somatotopically organized)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

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

A

ventral posterior lateral (VPL) nucleus of thalamus

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

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

Study These Flashcards
A

VPL nucleus of thalamus

post-central gyrus, area 3,1,2

22
Q

With damage to dorsal columns, what is the implication?

Study These Flashcards
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?

Study These Flashcards
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?

Study These Flashcards
A

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

25
What modalities does spinothalmic system conduct?
pain and temperature | nondiscriminative touch
26
Where is cell body of 1st order neuron of the spinothalmic tract?
cell bodies in DRG
27
Describe the central process of 1st order neuron of the spinothalmic tract?
central process ascend/descend 2-3 segments in LISSAUER'S TRACT then enter dorsal horn
28
2nd order neuron of spinothalmic system cell bodies located in:
delta fibers: lamina I or lamina V | C fibers: intermediate grey or dorsal horn
29
Describe pathway of C fibers - of spinothalmic system:
take an indirect course | form a polysynaptic pathway through reticular formation known as spinoreticular fibers
30
Where does decussation occur for spinothalmic system?
both delta and C fibers decussate in anterior grey matter in SC
31
After decussation, spinothalmic 2nd oder neurons form what tract?
contralateral spinothalmic tract | - in anterior half of lateral funiculus
32
What is decussation?
crossing the midline
33
Cell bodies of 3rd order neuron in spinothalmic system are located in
VPL nucleus OR intralaminar nuclei
34
Describe the cell bodies of 3rd order neuron in spinothalmic system located in VPL:
fibers from lamina I and V "fast" pain (A delta fibers) Well localized, sharper, epicritic pain
35
Describe the cell bodies of 3rd order neuron in spinothalmic system located in intralaminar nuclei:
spinoreticular fibers "slow" pain (C fibers) poorly localized, dull aching, protopathic chain
36
VPL 3rd order neuron destination in spinothalmic system:
to somatosensory cortex | postcentral gyrus, area 3, 1, 2
37
Intralaminar nuclei 3rd order neuron destination in spinothalmic system:
to widespread areas of cortex
38
Evaluation of sensory system from periphery to sensory cortex is known as
somatosensory evoked potentials
39
somatosensory evoked potentials process:
stimulation distally on limb recording on scalp series of wave forms produced correspond to structures/synapses along sensory tracts
40
What modalities does unconsious proprioception to cerebellum conduct?
joint position | proprioception
41
What receptors are involved in unconsious proprioception to cerebellum?
GTO muscle spindle joint mechanoreceptors
42
Generally, unconsious proprioception to cerebellum system 1st order neuron is in:
DRG
43
Generally, unconsious proprioception to cerebellum system 2nd order neuron is in:
dorsal horn
44
What specific tracts are in the unconscious proprioception to cerebellum system?
dorsal spinocerebellar tract ventral spinocerebellar tract cuneocerebellar tract
45
Cerebellar trats project to?
ipsilateral Cb
46
Lesions of cerebellum produce?
ipsilateral deficits
47
Damage to spinothalmic tract results in:
contralateral loss pain and temperature
48
Why does most tactile sensation remain with spinothalmic lesion?
due to overlap in function with dorsal column system
49
Which modalities are specific to spinothalmic system?
ITCH and TICKLE | they are lost with damage to spinothalmic tract (no overlap with dorsal column like other tactile sensation)
50
What is thalamic pain syndrome?
chronic pain syndrome caused by dysfxn of thalamus | often as a result of CVA effecting posterior cerebral artery

Neuroscience II (13 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions