Sensory Function Flashcards

1
Q

5 types of somatosensory receptors

A
  1. mechanoreceptors
  2. thermoreceptors
  3. nocireceptors
  4. proprioceptors
  5. vestibular receptors
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2
Q

mechanoreceptors

A

local tissue deformation in skin and viscera

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3
Q

thermoreceptors

A

temperature in skin and brain

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4
Q

nocireceptors

A

pain in skin, viscera, and muscle

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5
Q

proprioceptors

A

movement and force in muscles and joints

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6
Q

vestibular receptors

A

head acceleration and tilt

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7
Q

types of sensory receptors

A
  1. specialized endings of afferent axons

2. separate cells that respond to stimuli and synapse to afferent neurons

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8
Q

how is stimulus intensity related to receptor potential

A

positively correlated

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9
Q

how is receptor potential related to action potential

A

all or none response at a threshold

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10
Q

how is stimulus intensity related to rate of action potentials

A

positively correlated

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11
Q

3 examples of different types of mechanoreceptors

A
  1. Ruffini corpuscles = warmth
  2. Mekle’s corpuscles = touch
  3. free nerve endings = pain
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12
Q

frequency code

A

bigger stimulus = more membrane channels in sensory endings that are distorted

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13
Q

population code

A

big stimulus = more sensory neurons recruited into activity

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14
Q

temporal pattern code

A

variability of firing rate may mediate certain types of sensation

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15
Q

2 main sensory axon types

A
  1. Ia sensory

2. IV sensory

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16
Q

are Ia sensory myelinated? what is their conduction velocity?

A

yes, 80-120 m/s

17
Q

are IV sensory myelinated? what is their conduction velocity?

A

no, 0.5-2 m/s

18
Q

associated sensory endings with Ia sensory

A

muscle spindle primary endings

19
Q

associated sensory endings with IV sensory

A
  • nociceptors

- warmth thermoreceptors

20
Q

2 main types of motor axons

A
  1. alpha motor

2. gamma motor

21
Q

are alpha motor myelinated? what is their conduction velocity

A

yes, 80-120 m/s

22
Q

are gamma motor myelinated? what is their conduction velocity

A

no, 4-24 m/s

23
Q

alpha motor muscle fibers

A

extrafusal muscle fibers

24
Q

gamma motor muscle fibers

A

intrafusal muscle fibers

25
Q

2 point discrimination test

A

determines the closest distance that you can differentiate as being 2 separate stimuli

26
Q

where is 2 point discrimination test best? where is it worst?

A
best = hands and face
worst = abdomen and proximal parts of limbs
27
Q

lateral inhibition

A

sharpens sensory contrast by focusing activation of neurons

28
Q

topographic maps

A

projection areas in sensory cortex are related to functional importance

29
Q

do topographic maps change?

A

yes, they are plasticity

30
Q

dynamic plasticity

A

topographic maps are now believed to constantly change