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Neurophys Mod 2 > Touch > Flashcards

Touch Flashcards

1
Q

4 modalities of somatic sensation

A

Tactile
Thermal
Pain
Proprioception

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2
Q

Large, myelinated A fibers mediate sensations of :

A

Touch
Pressure
Vibration

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3
Q

Small, unmyelinated C fibers mediate sensations of :

A

Itch

Tickle

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4
Q

2 types of touch:

A

Crude

Fine

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5
Q

Crude touch provides stimulus of :

A

Contact

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6
Q

Fine touch provides stimulus of :

A 
Exact information:
Location
Shape
Size 
Texture
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7
Q

2 mechanoreceptors in superficial skin:

A

Meissner’s corpuscle

Merkel disk

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8
Q

Meissners corpuscle are (RAPIDLY/ SLOWLY) adapting?

A

Rapidly adapting

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9
Q

Merkel disks are (RAPIDLY/ SLOWLY) adapting

A

Slow adapting

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10
Q

2 mechanoreceptors in deep subcutaneous tissue?

A

Pacinian corpuscle

Ruffini ending

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11
Q

Meissner’s corpuscle is a ___ corpuscle whose receptors are surrounded by ___ cells

A

Tactile

Schwann cells

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12
Q

Pacinian corpuscle is a ___ corpuscle and sense?

A

Lamellated

Vibration

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13
Q

Ruffini endings respond to deep and continuous?

A

Pressure

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14
Q

Free nerve endings that wrap around hair follicles:

…..instead of ____

A

Hair follicle receptors

Meissner corpuscle

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15
Q

2 types of receptors in hairy skin:

A

Hair follicle receptors

Field receptors

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16
Q

2 point threshold is the ___ distance between 2 detectable stimuli

A

Minimum

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17
Q

Slow adapting mechanoreceptors continue to ___ to a stimulus and require ___ pressure

A

Respond

Steady pressure

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18
Q

Rapidly adapting receptors respond to the __ and __ of stimulation

A

Onset

Offset

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19
Q

Most important receptors for pressure:

A

Pacinian

Ruffini

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20
Q

Vibration is determined by what 2 sensors?

A

Meissner

Pacinian

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21
Q

All sensory neurons are ___ sensory with nuclei in___

A

First-order sensory

Dorsal root ganglion

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22
Q

3 types of primary sensory fibers:

A

A-beta
A-delta
C fibers

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23
Q

A-beta fibers detect:

A

Fine touch
Pressure
Proprioception

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24
Q

A-delta fibers are mechanical nociceptors that detect:

A

Crude touch
Cold
Fast/ sharp pain

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25
Q

C-fibers are polymodal nociceptors that detect:

A

Temperature

Slow/ dull pain

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26
Q

The gray mater of the spinal cord is divided into 3 functional regions:

A

Dorsal horn
Intermediate zone
Ventral horn

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27
Q

Histological laminae I-VI correspond to what functional area?

A

Dorsal horn

28
Q

Histologic laminae VII is roughly equivalent to ___ zone

A

Intermediate

29
Q

Histological laminae XIII ands IX comprise ___ horn

A

Ventral

30
Q

Histological lamina X is gray matter surrounding what structure?

A

Central canal

31
Q

2 pathways to brain:

A

DC/ML

Anterolateral system

32
Q

DC/ ML=

A

Dorsal column/ medial lemniscus

33
Q

DC/ML is the pathway for perception of :

A

Touch and proprioception

34
Q

DC/ML is formed by ___ cuneatus, ___ fasicuslus, and ____ lemniscus

A

Fasciculus cuneatus
Fasiculus Gracilis
Medial lemniscus

35
Q

The anterolateral system mediates sensations of ___

A

Pain and temperature

36
Q

Anterolateral system has both ___ and ___ pathways to thalamus

A

Direct

Indirect

37
Q

ALS=

A

Anterolateral system

38
Q

ALS first-order sensory neurons have cell bodies in the ?

A

Dorsal root ganglion

39
Q

Laminae I = ___ zone

A

Marginal zone

40
Q

Laminae II=

A

Substantia gelatinosa

41
Q

Laminae IV=

A

Nucleus proprious

42
Q

Laminae V and VI=

A

Dorsal nucleus

43
Q

Lamina VII=

A

Intermediate zone

44
Q

3 major divions of somatosensory cortex:
S-I=
S-II=
And __ areas 5,7

A

Primary
Secondary
Posterior parietal cortex

45
Q

Neurons of S-II project to ___ cortex and form ___ memory

A

Insular

Tactile

46
Q

Brodmann’s areas 5 and 7=___ cortex

A

Posterior parietal cortex

47
Q

Dominant modality of area 3a

A

Proprioception

48
Q

Dominant modality area 3b

A

Cutaneous mechanoreceptors

49
Q

Dominant modality of area 1

A

Rapidly adapting cutaneous receptors

50
Q

Dominant modality of area 2 is a ___ modality segment; processes ___ and ___ receptors

A

Weak
Slow
Rapid

51
Q

Dominant modality of are 2 is responsible for sensing the __- and ___ of objects

A

Size

Shape

52
Q

Dominant modality 1 and 2 represent ___ input form hand/ fingers

A

Convergent

53
Q

Dominant modality area 3b and 1 sense surface ___

A

Texture

54
Q

Layer IV of cortex receives input from :

A

Thalamus

55
Q

Layer VI of cortex projects to:

A

Thalamus

56
Q

Layer II and III project to other ___ regions

A

Cortical

57
Q

Layer V of cortex projects to ___ structures

A

Subcortical

58
Q

___ inhibition sharpens the representation of a puncture stimulus by limits spread of excitation of convergent chains

A

Feed-forward inhibition

59
Q

Winner-take-all strategy for strongest competing response best describes ___ inhibition.

A

Lateral

60
Q

2 point discrimination is caused by ___ inhibition which suppresses excitation of neurons between the points.

A

Lateral inhibition

61
Q

4 types of higher order somatosensory neurons (DOTS):

A

Direction
Orientation
Texture
Shape

62
Q

Lesion of 3b causes deficits of discrimination of ___ and well as size and shape

A

Texture

63
Q

Lesion of area 1 causes deficit in the assessment of ___ of objects

A

Texture

64
Q

Lesion of area 2 alters ability to differentiate ___ and ___ of objects

A

Size

Shape

65
Q

Lesion of S-I results in deficit in ___ sense… serious motor deficit in ___ function

A

Position sense

Hand function

66
Q

Lesion in S-II cause severe impairment in discrimination both ___ and ___

A

Shape

Texture

67
Q

Lesion of posterior parity cortex can lead to sensorimotor abnormalities resulting in poor ___ coordination

A

Eye-hand

Neurophys Mod 2 (14 decks)

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