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Flashcards in CNS Part 3 Deck (62)
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1

Special senses vs somatosensory differences in receptors

Special- high density of receptors in target organ, discrete travel and bundle processing

Somatosensory- diffuse pattern, covers a large field

2

Same second messengers can have __ responses based on cell

Different

3

Sensory receptors transduce enviro changes into electronic signals. Connect to __ __ neurons which relay info via __ __ to brain and spinal cord. __ __ neuron cell bodies housed in __ __ and __ __ __

Primary afferrent
Action potentials
Primary afferrent, dorsal root, cranial nerve ganglia

4

Cranial nerve ganglia have a __ process that extends dismally within a __ __ to sensory receptors, and a __ __ that enters the spinal cord or brain through a __ __ or __ __

Peripheral, peripheral nerve
Central process, dorsal root or cranial nerve

5

Each __ __ __ has a specific cutaneous field

T4 Dermatome innervated by

DRG

T4 DRG

6

Exteroceptive info: interaction of __ with the __

2 types

Skin, enviro

Fine discriminatory touch and pain/temp

7

Fine discrim touch powered by 2

Pain and temp powered by 2

A alpha and a beta

A delta and c (fast and slow pain )

8

Proprioceptive info: body and limb position informing ___

Receptors in __, __, and __

Movement

Joints, muscles, tendons

9

Enteroceptive info: __ __ of the body. Ex __ in __ or __

Internal status

Stretch, bladder, gut

10

One thing all sensory receptors (thermal, chemical, pain, etc) is stimuli causes what

Changing membrane permeability to get action potential

11

Receptor potentials can change by 5

Mechanical, chemical, temp, electromagnetic radiation, pain

12

Process same for all receptor potentials when get to what level

Action potential

13

Sensory receptors will adapt either __ or __ to __ stimulation by a variety of mechanisms

Partially or completely, constant

14

Mechanosensitive afferrent fibers __ __ __ or __ __

Tactile fibers fast
Slow adaptation

15

Type I mechanoreceptive afferrent fibers have __ receptive field. Higher density of these fibers leads to better __ __ discrimination
Type II fibers have a ___ receptive field

Small, two point

Large

16

If a pin pricks finger what would type I vs type II tell you

Type I- exactly where prick is
II- something stabbing your finger but can't tell where

17

Fast adapting: get message __ at first and stop __ with time
Slow adapting is ___

Loudly, firing
Opposite

18

What kind of fibers are:
Meisner corpuscles
Pacinian corpuscles

Fast adapting 1
Fast adapting 2

19

What kind of fibers are merkels disks and ruffini endings

Slow adapting 1 and slow adapting 2`

20

More receptors leads to a ___ image

Clearer

21

Receptor potential vs stimulus intensity is a ___ patterned chart because can't sense change above ___

Curved not linear

100%

22

Spatial location: __ of neurons within a __ __

Population, receptive feel

23

Stimulus intensity: frequency of __, __ of sensory receptors involved

Action potential, number

24

Stimulus frequency: ___ interval

Inter stimulus

25

Each nerve tract ___ at a specific point in the CNS and carries a selective sensory modality. (Pain and mechanoreceptors not carried by same tract)

Terminates

26

Sensation is perceived when a specific stimulated __ leads to specific __ in the CNS. Ex separate dedicated cell populations in __ and __ __

Nerve, areas

Thalamus, somatosensory cortex

27

Alteration of the specific nerve tracts activity will only change the __ of the stimulus (___) vs changing the __ of stimulus perceived (__)

Intensity, quantitative, type, qualitative

28

Dorsal column medial leminiscal
1. Highly __ touch
2. __ sensations (__ gradation of intensity)
3. __ sensations (__)
4. __ contact sensation
5. __ position
6. __ sensations

1. Localized
2. Touch, fine
3. Phasic, vibratory
4. Skin
5. Joint
6. Pressure

29

DCML
Composed of __ __ fibers transmitting signals at __-__m/sec
__ spatial orientation

Large myelinated, 30-110, more

30

Anterolateral (spinothalamic) system
1. __
2. ___ sensations
3. __ touch and ___
4. __ and __
5. ___ sensations

Pain
Thermal
Crude, pressure
Tickle and itch
Sexual