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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
Q

receptors of crude touch

A

mechanoreceptors:
1) Free nerve endings
2) hair end organs

26
Q

mechanism of stimulation of crude touch receptors

A

mechanical deformity

27
Q

afferents of crude touch

A

A𝛿
C type fibers

28
Q

ascending sensory pathway of crude touch

A

ventral ALS

29
Q

higher perception site of crude touch

30
Q

adaptation of crude touch receptors

31
Q

how to examine crude touch sensation

A

cotton wool test

32
Q

tickle sensation

A

local repeated mechanical stimulation by light moving object

33
Q

itch sensation

A

irritation sensation caused by histamine & kinins
may lead to scratch reflex

34
Q

receptors of itch & tickle sensation

35
Q

afferents of itch & tickle sensation

A

C type fibers

36
Q

ascending sensory pathway of itch & tickle sensation

A

ventral ALS

37
Q

higher perception site of itchy & tickle sensation

38
Q

thermal sensation receptors

A

Thermoreceptors:
hot—> FNE
cold—> FNE & Krause end bulb

39
Q

mechanism of stimulation of thermoreceptors

A

conc. changes of metabolites—> (+)/(-) ion channels

40
Q

TRP

A

transient receptor potential= ion channels

41
Q

how are TRP activated

A

excess change in temp, above 43° C
this mediates pain sensation

42
Q

distribution of thermoreceptors?
which receptors are more widely distributed?

A

in spots.
cold spots are more by 3-10 times

43
Q

thermoreceptors are commonly found in

A

lips>hands>trunk

44
Q

cold receptors range of stimulation

A

10-43° C
maximal at 25° C

45
Q

hot receptors range of stimulation

A

30-50° C
maximal at 45° C

46
Q

sensation felt at less than 15°C

47
Q

sensation felt at more than 45°C

A

hot pain (TRP)

48
Q

sensation felt at 30-35° C

A

indifferent sensation
area of overlap
near body temp

49
Q

protopathic sensations

A

sensations perceived by thalamus

50
Q

epicritic sensations

A

sensations percieved by cortex

51
Q

afferents of thermal sensations

A

warm—> C
Cold—> A𝛿 + C

52
Q

ascending sensory pathway of thermal sensations

A

lateral ALS

53
Q

higher perception site

A

thalamus + cortex

54
Q

adaptation of thermoreceptors

A

moderate
hot>cold

55
Q

how to examine theram sensation

A

two test tube test

56
Q

paradoxical cold sensation

A

sensation of cold that occurs due to exposure to hot temperatures

57
Q

paradoxical cold sensation occurs due to

A

rise of temperature above 40° —>sudden & rapid discharge of impulses from cold receptors

CNS (29 decks)

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