Unit I Somatic Sensation Flashcards

(35 cards)

1
Q

Stimulus changed into electrical signal is

A

transduction

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2
Q

List some different types of stimuli

A

mechanical, chemical, temperature, and electromagnetic

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3
Q

What 4 attributes of sense are there?

A

Modality, location, intensity, and timing

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4
Q

What two sytems of nerve fiber classification are there?

A

Erlanger’s and LLoyd’s

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5
Q

Differentiate the two classification systems of nerve fibers

A

Erlanger’s is A, B, and C

LLoyd’s is I, II, II, IV

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6
Q

What are the parameters of speed of conduction?

A

fiber diameter and myelination

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7
Q

What type of nerves Erlanger’s system used for?

A

motor nerves and skin afferents

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8
Q

What type of nerves is LLoyd’s used for?

A

afferents from receptors in muscle and spinal joints

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9
Q

Describe slow adaptation

A

it provides continuous information

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10
Q

Describe fast adaptation

A

It reacts strongly when a change is taking place

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11
Q

What are the most heavily sensory innervated spinal joints?

A

the cervicals

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12
Q

Describe type I mechanorecptors

A

they are in the outer layers of the joint capsule

they have a low threshold

they are slow adapting

have tonic effects on lower motor neuron pools

fire at a degree proportional to joint movement

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13
Q

Describe type II mechanorecptors

A

they are in the deepest layer of the joint capsule

they have a low threshold

they rapidly adapt

not activity in immobilized joints

monitors joint movements

phasic effecys on lower motor neurons pools

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14
Q

Describe type III mechanoreceptor

A

found in spinal joints

slow adaptation

high threshold

joint version of a GTO

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15
Q

Describe type IV mechanoreceptors

A

theyre nociceptors

high threshold

inactive in normal joint

activates with joint narrowing, incresaed capsular pressure, and chemical irritation

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16
Q

What is tactile information?

A

the ability to recognize objects in the hand based on touch alone

17
Q

What is stereognosis?

A

the ability to perceive through touch

18
Q

What system does sterognosis test?

A

the dorsal column-medial leminiscal system

19
Q

Besides the ability to perceive what else does sterognosis test?

A

the cognitive processes in the brain where integration occurs

20
Q

What categories of sensory modalities are there?

A

pressure, cold, warm, and nociceptors

21
Q

Wetness is the perception of

A

pressure and temperature receptors being stimulated

22
Q

Ticklishness is the perception of

A

gentle stimulation of pressure receptors

23
Q

Itching is the perception of

A

gentle stimulation of nicceptors

24
Q

What is used for detection of microtexture?

A

pacinian corpuscles

25
Depth of indentation and change in curvature of skin surface are encoded by discharges rates of
Slow adapting afferent fibers
26
Velocity and rate of change in skin surface curvature are encoded by discharge rates of
both slow adapting and rapidly adapting afferent fibers
27
What are the rapidly adapting cutaneous mechanoreceptors?
Meissner's corpuscles, hair follie recptors, and pacinian corpuscles
28
Where are meissner's corpuscles found?
in glabrous skin (non-hairy)
29
Where in glabrous skin are meissner's heavily concentrated?
in fingertips
30
What do meissner's detect in the fingertips?
singals edges, and registers sideways shearing of skin
31
What are the slow adapting cutaneous mechanoreceptors?
merkel's discs and ruffini end organs
32
What do merkel's disc's sense?
curvature of an object's surface
33
What activates ruffini end organs?
stretching of the skin
34
What are the superficial receptors of the skin?
meissner's and merkel's
35
What the deep receptors of the skin?
pacinian's and ruffini's