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Flashcards in Phys - Sensory Phys Deck (75)
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1

what is the largest and fastest sensory (affarent) fiber type of the peripheral nerve fibers and where is its receptor

- what classification of fiber is it

A-alpha

primary muscle spindles and golgi tendon organ

- class Ia and Ib

2

what is the smallest and slowest sensory (affarent) fiber type of the peripheral nerves and where is its receptor

- what classification of fiber is it

C fibers

skin mechanoreceptors, thermal receptors, nociceptors

- class IV

3

what type of fiber is A-beta fibers, what class, and where are its receptors

sensory

class II

secondary muscle spindles, skin mechanoreceptors

4

what type of fiber is A-delta fibers, what class, and where are its receptors

sensory

class III

skin mechanoreceptors, thermal receptors, nociceptors (same as C fibers)

5

where are the receptors for A-alpha motor fibers

extrafusal skeletal muscle fibers

6

where are the receptors for A-gamma motor fibers

intrafusal muscle fibers

7

what type of fiber are B fibers

- where are their receptors

motor (efferent) fibers

preganglionic autonomic fibers

8

where are the receptors for C motor fibers

postganglionic autonomic fibers

9

what sensory system does not relay information through the thalamus on its way to the cerebral cortex?

olfactory

10

in somatosensory systems, what nuclei corresponds to the body and what corresponds to the face

body: VPL

face: VPM

11

describe receptor adaptation

when a stimulus persists unchanged for several minutes without a change in position or amplitude, causing the neural response to diminish and sensation to be lost

12

compare slowly and rapidly adapting receptors

slowly: respond to prolonged and constant stimulation

rapidly: respond only at the beginning or end of stimulus (when stimulus intensity increases or decreases)

13

what cells of the skin are responsive to taps or flutters

- what is the receptive field size?

meissner's corpuscles 

- small receptive field size

14

what cells of the skin are responsive to motion and direction

hair follicle receptors

15

what cells in the skin are responsive to vibration?

- what is their receptive field size?

pacinian corpuscles

- large receptive field size

16

what cells of the skin are receptive to touch and pressure?

- what is their receptive field size?

merkel discs

- small receptive field size

17

what cells of the skin are responsive to skin stretching?

 - what is their receptive field size?

ruffini corpuscles

- large receptive field size

18

what kind of response (slowly or rapidly) do meissner's corpuscles have to stimulation?

rapidly adapting

19

what kind of response (slowly or rapidly) do pacinian corpuscles have to stimulation?

rapidly adapting

20

what kind of response (slowly or rapidly) do merkel cells have to stimulation?

slowly adapting

21

what kind of response (slowly or rapidly) do ruffini corpuscles have to stimulation?

slowly adapting

22

what kind of response (slowly or rapidly) do hair follicle receptors have to stimulation?

rapidly or slowly adapting

23

where is tactile acuity for 2 point discimination the highest and lowest

highest: fingertips and lips (smallest receptive fields)

lowest: calf, back, and thigh (largest receptive fields)

24

how does pre-synaptic inhibition occur

GABA causes influx of Cl- into axon --> hyperpolarization occurs --> less Ca2+ enters cytosol --> less NT release

25

what is the purpose of pre-synaptic inhibition

improves brain's ability to localize the signal

26

what layers of the cortex are enlarged because they are the primary sensory cortex and are the main site of termination of axons from the thalamus

III and IV

27

in the cortex, compare neurons stacked above and below each other

- compare neurons stacked side by side

above and below: fundamentally similar

side by side: significantly different

28

what layer of the cortex do input signals first enter

layer IV

29

function of primary somatosensory cortex (S1) and where is it located

integration of information for positional sense and size and shape discimination

- located in the post-central gyrus

30

function of secondary somatosensory cortex (S2) and where is it located

comparisons between objects, different tactile sensations and detmeining whether something becomes a memory

- wall of sylvian (lateral) fissure