Unit I Somatic Sensation Flashcards Preview

Physiology II > Unit I Somatic Sensation > Flashcards

Flashcards in Unit I Somatic Sensation Deck (35)
Loading flashcards...
1
Q

Stimulus changed into electrical signal is

A

transduction

2
Q

List some different types of stimuli

A

mechanical, chemical, temperature, and electromagnetic

3
Q

What 4 attributes of sense are there?

A

Modality, location, intensity, and timing

4
Q

What two sytems of nerve fiber classification are there?

A

Erlanger’s and LLoyd’s

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

6
Q

What are the parameters of speed of conduction?

A

fiber diameter and myelination

7
Q

What type of nerves Erlanger’s system used for?

A

motor nerves and skin afferents

8
Q

What type of nerves is LLoyd’s used for?

A

afferents from receptors in muscle and spinal joints

9
Q

Describe slow adaptation

A

it provides continuous information

10
Q

Describe fast adaptation

A

It reacts strongly when a change is taking place

11
Q

What are the most heavily sensory innervated spinal joints?

A

the cervicals

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

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

14
Q

Describe type III mechanoreceptor

A

found in spinal joints

slow adaptation

high threshold

joint version of a GTO

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

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
Q

Depth of indentation and change in curvature of skin surface are encoded by discharges rates of

A

Slow adapting afferent fibers

26
Q

Velocity and rate of change in skin surface curvature are encoded by discharge rates of

A

both slow adapting and rapidly adapting afferent fibers

27
Q

What are the rapidly adapting cutaneous mechanoreceptors?

A

Meissner’s corpuscles, hair follie recptors, and pacinian corpuscles

28
Q

Where are meissner’s corpuscles found?

A

in glabrous skin (non-hairy)

29
Q

Where in glabrous skin are meissner’s heavily concentrated?

A

in fingertips

30
Q

What do meissner’s detect in the fingertips?

A

singals edges, and registers sideways shearing of skin

31
Q

What are the slow adapting cutaneous mechanoreceptors?

A

merkel’s discs and ruffini end organs

32
Q

What do merkel’s disc’s sense?

A

curvature of an object’s surface

33
Q

What activates ruffini end organs?

A

stretching of the skin

34
Q

What are the superficial receptors of the skin?

A

meissner’s and merkel’s

35
Q

What the deep receptors of the skin?

A

pacinian’s and ruffini’s