Ascending Spinal Pathways Flashcards

1
Q

anatomical types of receptors

A

free nerve endings - painencapsulated - touch, mechanicalspecial neural receptor cells - special/chemical senses

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2
Q

functional types of receptors

A

mechanoreceptorsnociceptorsphotoreceptorschemoreceptorsthermoreceptors

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3
Q

adequate stimulus

A

most appropriate stimulus that will allow receptor to pass current

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4
Q

modality

A

the sense it carriesex/ stimulus = lightmodality = vision

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5
Q

receptor potential

A

proportional to strength of stimulus-graded potentialat threshold - primary afferent produces action potential

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6
Q

pre-cenral gyrus

A

primary motor cortex

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7
Q

post-central gyrus

A

primary somatosensory cortex

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8
Q

brodmans areas post central gyrus?

A

3, 1, 2 somatosensory

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9
Q

brodmans area for pre-central gyrus?

A

4motor

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10
Q

targets for somatosensation

A

reflex arcreticular formationhypothlamus > limbic systemthalamus > cerebral cortexcerebellum**divergence of neurosystem

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11
Q

labeled line code

A

if you stimulate this tract-modality of this tract results in certain sensation being feltcodes modality

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12
Q

population code

A

as intensity increases number of receptors activated increased

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13
Q

frequency code

A

as intensity increases - rate of APs increases

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14
Q

receptor field

A

part of environment to which neuron responds

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15
Q

resolution

A

ability to distinguish between 2 separate stimuluslow density - large receptive field - less resolution-few number of neurons in cortexhigh density - small receptive field - more resolution-larger number of neurons in cortex

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16
Q

large receptive field

A

lower density lower resolutionfewer number of neurons in cortex

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17
Q

general proprioception

A

static position sense - know where is in spacekinesthesia - feeling movement

18
Q

axons of PCML

A

A-alphalarge diameter, myelinated - fast

19
Q

joint receptors

A

joint angle and tension in joint capsule

20
Q

golgi tendon organs

A

sense tension in organs

21
Q

muscle spindles

A

in extrafusal fibes-detect change in muscle length

22
Q

skin mechanoreceptors

A

also signal in proprioception

23
Q

proprioceptors

A

joint receptorsgolgi tendonsmuscle spindlesskin mechanoreceptors

24
Q

discriminative touch

A

high degree accuracy in locationex/ graphesthesia / stereognosis

25
vibration
often tested with tuning fork
26
sensory ataxia
without coordination-lack of proprioceptiondysmetria - incorrect meteringwide base stancetruncal swaydifficult turninginaccuracy in voluntary movements
27
anterolateral system
nociception, temp, crude touch4 tracts
28
region of tracts of ALS
in anterior and lateral funiculi-anterolateral region of cord
29
spinothalamic tract
conscious of ALSprojects to primary somatosensory cortexprimarily from somatic structures
30
tracts of anterolateral system
spinothalamicspinoreticular spinomesencephalicspinohypothalamic
31
spinoreticular tract
projects to reticular formation-alerts our attention to painful stimulus-focus attention-some autonomic tract
32
reticular formation
loose group of nuclei in core of brainstem, from medulla to dicencephalon
33
spinomesencephalic tract
to periaqueductal greypain modulation-descend spinal cord
34
spinotectal tract
subset of spinomesencephalic tract"visual grasp reflex"
35
spinohypothalamic tract
coordinate autonomic response to stimuli-feel nausea with intense pain
36
emotional response to pain
RF and hypothalamus > limbic systemspinoreticular and spinohypothalamic tract
37
axons of anterolateral system
A-betaA-delta and Clightly or unmyelinatedsmall-medium diameter-slower conducation
38
A-beta axons
touch and temperatureanterolateral system
39
A-delta and C fibers
painanterolateral system
40
C-fibers
unmyelinated