6.1 General Senses Flashcards Preview

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Flashcards in 6.1 General Senses Deck (44):
0

T/F In general senses, there is a specific, specialized organ or structure for detecting stimuli

False- NO Specific organ

1

3 Physiologic types of tactile sensation

Mechanoreceptive
Thermoreceptive
Nociceptive

2

3 classifications of tactile sensation based on location

Exteroreceptive
Proprioceptive
Deep

3

What classifications of tactile sensation based on location is from body surface

Exteroreceptive

4

Define proprioceptive

Position senses
Pressure senses from feet
Equilibrium

5

Classification of tactile senses based on information carried

1. Pain and temperature
2. Fine discriminatory touch

6

Stimulation of receptors in skin or tissue directly beneath the skin

Touch

7

Tactile sensation where there is deformation of the skin

Pressure

8

Tactile sensation where there is rapid repetitive signal

Vibration

9

T/F Touch, pressure, vibration are detected by the same type of receptors

True

10

Tactile receptor that is widely distributed and detects touch and pressure

Free nerve endings

11

Free nerve ending : touch and pressure
________________ : vibration and deep pressure

Pacinian corpuscle

12

Specialized mechanoreceptors sensitive to movement of objects over skin

Meissner's corpuscle

13

Meissner's corpuscle : encapsulated by dendrites
Pacinian corpuscle : _______________

encapsulated by lamellae

14

Sensation for Ruffini's endings

Continuous deformation

15

Describe adaption of different tactile receptors

Hair-end organ- rapidly adapting
Meissner's corpuscle- fast adapting
Pacinian corpuscle- rapidly adapting
Merkel's disc- slow adapting (initially strong then adapting weaker signal)
Ruffini's endings- slow adapting

16

2 types of summation

1. Spatial summation
2. Temporal summation

17

Summation wherein increasing signal strength is transmitted by using progressively greater number of fibers

Spatial summation

18

Increase in stimulus -> __(1)__ nerve fibers stimulated -> ___(2)___ sensation felt

1. More
2. Stronger

19

Summation wherein increasing the frequency of nerve impulses in each fiber will increase signal intensity

Temporal summation

20

As the impulse increases -> ______ signal is felt

Stronger

Note: as impulses are sent more rapidly, the strength of the stimulus is perceived to be higher

21

Spatial : stimulus
Temporal : _______

Impulse

22

Accumulation of neurons

Neuronal pool

23

Stimuli below the threshold for excitation

Subthreshold stimuli

24

Stimuli above the threshold required for excitation

Suprathreshold stimuli

25

The stimulation is over but the signal persists

Afterdischarge

Note: rhythmical signals like breathing

26

Classify according to adaptation response and receptive field:
MEISSNER

F1 (fast adapting type 1)

27

Classify according to adaptation response and receptive field:
PACINIAN

F2 (fast adapting type 2)

28

Classify according to adaptation response and receptive field:
MERKEL

S1 (slow adapting type 1)

29

Classify according to adaptation response and receptive field:
RUFFINI

S2 (slow adapting type 2)

30

T/F receptors are clustered at certain points

True

31

Condition for area to be highly sensitive

Dense innervation + small receptive field

32

General sensory pathway

Receptor -> first order neuron -> spinal cord/brain stem -> second order neuron -> thalamus -> third order neuron -> cortex

33

2 sensory pathway

1. Dorsal column-medial lemniscal pathway
2. Anterolateral system/ spinothalamic tract

34

DCML : medulla
_________ : spinal cord

Anterolater/ Spinothalamic tract

35

Brodmann's area for somatosensory cortex

Brodmann's area 1-3

36

Brodmann's area for somatosensory association areas

Brodmann's area 5,7

37

Loss of ability to recognize complex objects felt on one side

Amorphosynthesis

38

Ability to discern that 2 objects touching the skin are truly 2 distinct points

Two-point discrimination

39

At high levels of stimulation it becomes harder to detect changes in stimulus strength

Weber-Fechner Principle

40

In vibration sense, up to _____cycles/sec can be detected

700

41

Specific cutaneous region supplied by a given dorsal root ganglion

Dermatome

42

Pain receptors are ________

Free nerve endings

43

Agent most responsible for causing pain following tissue damage

Bradykinin