8.2 Flashcards

1
Q

4 aspects of somthing that can be percieved?

A
  1. Modality
  2. intensity
  3. Duration
  4. Location
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2
Q

describe what is Modality?

A

what kind of Receptor? Quality?

vision, hearing, taste, smell, touch, cold, warm, prpriocepption, acceleration, pain….

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3
Q

give an example for a labeled line?

A

visual pathway from the retina to the visual cortex

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4
Q

define the threshold?

A

point when the stimulus in 50% of the cases is detected and in 50% of the cases no stimulus occurs

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5
Q

what does the threshold depend on?

A

intensity of the stimulus

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6
Q

how can we code intensity?

A
  1. AP frequency (high f of AP -> larger intensity)
  2. Population coding
  3. Related but different type of R are activated
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7
Q

how can we alter the duration of a percieved sense?

A

by adaptation

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8
Q

how does the location of the stimulus can be analize?

A

somatotopic organization

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9
Q

sensory neurons are typically ______

A

Pseudounipolar

*Bipolar in the retina, olfactory, auditory, vestibular

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10
Q

cell body of the Pseudounipolar neuron located in

A

Dorsal root Ggl

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11
Q

what somatosensory R types do we have?

A

mechanareceptors
thermoreceptors
nociceptors

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12
Q

what are the two possibilities for adaptation of receptors?

A
  1. rapidly adapting

2. slowly adapting

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13
Q

rapidly adapting receptors mechanism

A

surrounded by a capsule

can only detect signal if its quickly on and off

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14
Q

write down somatosensory R

A
  1. Pacinian (rapidly adapting- vibration)
  2. Ruffini (slowly adapting- stretch)
  3. Meissner (rapidly adapting- touch)
  4. Merkel (slowly- pressure)
  5. Muscle spindle and Golgi Tendon Organ (stretch)
  6. Thermoreceptors- (slowly adapting- free nerve endings)
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15
Q

cold VS hot fibers?

A

cold- A delta fibers

hot- C fibers

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16
Q

2 somatosensory pathways?

A
  1. Dorsal Column-Medial Leminiscus

2. Antero-Lateral (Spino-Thalamic Tract)

17
Q

Dorsal Column-Medial Leminiscus receptors?

A
Pacinian
Ruffini
Merkel
Meissner
and proprioceptors
18
Q

Dorsal Column-Medial Leminiscus responsible for?

A

fine touch
vibration
proprioception
2-point discrimination

19
Q

Antero-Lateral (Spino-Thalamic Tract) receptors?

A

warm and cold thermoreceptors

nociceptors

20
Q

Anterior SpinoThalamic Tract responsible for?

A

crude touch

21
Q

Lateral SpinoThalamic Tract responsible for?

A

pain and temparture

22
Q

write down somatosensory pathways

A

online picture

23
Q

Broadman’s area for somatosensory pathways?

A

in the post-cental gyrus

BA= 3,1,2