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[PHYSIO] Spinothalamic tract sensations Flashcards

1
Q

sensation

A

information about environment obtained by sensory receptors

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2
Q

perception

A

brain selects, organizes, interprets sensations

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3
Q

sensory unit

A

sensory axon + all its peripheral branches

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4
Q

receptive field

A

spatial distribution area from which stimulus produces response

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5
Q

general sensations are classified into

A

somatic
visceral

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6
Q

special sensations

A

vision
smell
taste
hearing
(+somatic)

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7
Q

organic sensations

A

thirst
hunger

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8
Q

emotional sensations

A

fear
sadness

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9
Q

somatic sensations are classified into

A

cutaneous
deep
mixed

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10
Q

cutaneous sensations

A

touch
temperature
pain

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11
Q

deep sensations

A

deep pain
proprioception

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12
Q

mixed sensations

A

vibration
stereognosis

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13
Q

stereognosis

A

perception & recognition of an object in absence of visual & auditory info

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14
Q

tactile mechanoreceptive sensations

A

touch
pressure
vibration

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15
Q

kinesthetic mechanoreceptive sensations

A

sense of position & movement

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16
Q

cortical sensations

A

sharply localized fine sensations

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17
Q

thalamic sensations

A

poorly localized crude sensations

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18
Q

slow pain
wide degrees of thermal sensations
crude touch
are…

A

thalamic sensations

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19
Q

fast pain
fine touch
vibration
fine degrees of thermal sensations
stereognosis
proprioception
deep pressure

A

cortical sensations

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20
Q

spinothalamic sensations (5)

A

pain
crude touch
thermal sensations
itch & tickle
sexual sensations

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21
Q

dorsal column sensations (5)

A

fine touch
deep pressure
vibration
stereognosis
proprioception

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22
Q

spinothalamic pathway alternative name

A

anterolateral system

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23
Q

spinothalamic pathway transmits
how?

A

crude touch
thermal signals
pain
by sequence of 3 order neurons

24
Q

crude touch definition?
properties?

A

ability to detect contact w objects
non-discriminatory, poorly localized

25
receptors of crude touch
mechanoreceptors: 1) Free nerve endings 2) hair end organs
26
mechanism of stimulation of crude touch receptors
mechanical deformity
27
afferents of crude touch
A𝛿 C type fibers
28
ascending sensory pathway of crude touch
ventral ALS
29
higher perception site of crude touch
thalamus
30
adaptation of crude touch receptors
rapid
31
how to examine crude touch sensation
cotton wool test
32
tickle sensation
local repeated mechanical stimulation by light moving object
33
itch sensation
irritation sensation caused by histamine & kinins may lead to scratch reflex
34
receptors of itch & tickle sensation
FNE
35
afferents of itch & tickle sensation
C type fibers
36
ascending sensory pathway of itch & tickle sensation
ventral ALS
37
higher perception site of itchy & tickle sensation
thalamus
38
thermal sensation receptors
Thermoreceptors: hot---> FNE cold---> FNE & Krause end bulb
39
mechanism of stimulation of thermoreceptors
conc. changes of metabolites---> (+)/(-) ion channels
40
TRP
transient receptor potential= ion channels
41
how are TRP activated
excess change in temp, above 43° C this mediates pain sensation
42
distribution of thermoreceptors? which receptors are more widely distributed?
in spots. cold spots are more by 3-10 times
43
thermoreceptors are commonly found in
lips>hands>trunk
44
cold receptors range of stimulation
10-43° C maximal at 25° C
45
hot receptors range of stimulation
30-50° C maximal at 45° C
46
sensation felt at less than 15°C
cold pain
47
sensation felt at more than 45°C
hot pain (TRP)
48
sensation felt at 30-35° C
indifferent sensation area of overlap near body temp
49
protopathic sensations
sensations perceived by thalamus
50
epicritic sensations
sensations percieved by cortex
51
afferents of thermal sensations
warm---> C Cold---> A𝛿 + C
52
ascending sensory pathway of thermal sensations
lateral ALS
53
higher perception site
thalamus + cortex
54
adaptation of thermoreceptors
moderate hot>cold
55
how to examine theram sensation
two test tube test
56
paradoxical cold sensation
sensation of cold that occurs due to exposure to hot temperatures
57
paradoxical cold sensation occurs due to
rise of temperature above 40° --->sudden & rapid discharge of impulses from cold receptors

CNS (29 decks)

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