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Neuroanatomy > S&F of Peripheral Sensory Receptors > Flashcards

S&F of Peripheral Sensory Receptors Flashcards

1
Q

Receptive field of Merkel discs?

A

Multiple small spots

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1
Q

Do Pacinian corpuscles have a slowly or rapidly adapting response?

A

Rapidly adapting

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1
Q

Which type of mechanoreceptor?

  • Ending is encapsulated
  • myelinated axon surrounds collagen fibrils
A

Ruffini endings

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2
Q

Which type of mechanoreceptor?

  • Encloses a stack of flattened epithelial cells
  • sensory terminal entwined between layers
  • axon is myelinated
A

Meissner’s corpuscles

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3
Q

Which type of mechanoreceptor?

  • Fluid filled capsule wrapped around bare nerve ending
  • filters out sustained stimuli
  • myelinated axon
A

Pacinian Corpuscles

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3
Q

Easy to localize? A-Mechanonociceptors

A

yes

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4
Q

What is the receptive field of Ruffini Endings?

A

Large and diffuse

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4
Q

Cooling receptors: myelinated or unmelinated axons?

A

Myelinated

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4
Q

Which nociceptor responds to intense mechanical force, high heat (> 45°C), noxious chemicals (bradykinin, histamine, etc.)?

A

C polymodal nociceptors

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4
Q

Easy to localize? C Polymodal nociceptors

A

No

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5
Q

C polymodal nociceptors: myelinated or unmyelinated axons?

A

unmyelinated (C-fiber)

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8
Q

What do Meissner’s corpuscles encode?

A

Low-frequency vibration

On/offset of skin indentation

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8
Q

What is the spatial summation code?

A

OVerall picture in brain is due to the sum of information provided by the different active and silent fibers

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9
Q

What percent of all sensory neurons in the DRG are nociceptors?

A

70%

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11
Q

Receptive field of Meissner’s corpuscles?

A

Single spot

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12
Q

Do Merkel discs have a slowly or rapidly adapting response?

A

Slowly adapting response

12
Q

What do Merkel discs encode?

A

Amount of force

14
Q

What are the superficial mechanoreceptors?

A

Merkel disks and Meissner’s corpuscles

15
Q

Which type of mechanoreceptor?

Responds to high frequency vibration

A

Pacinian corpuscles

17
Q

Do Ruffini Endings have a slowly or rapidly adapting response?

A

Slowly adapting, responds to stretching of skin

18
Q

Having no sheath helps C polymodal nociceptors respond to what?

A

Inflammatory chemicals

19
Q

Which receptors sense stretch of skin?

A

Ruffini Endings

20
Q

Which type of mechanoreceptor?

Fine touch, 2-point discrimination, sense abrupt changes in edges (bumps, corners)

Help adjust grip and relase when lifting objects

A

Meissner’s corpuscles

22
Q

What is the spatial summation code in relation to intensity of a stimulus?

A

The number of neurons firing

23
Q

Do Messner’s corpuscles have a rapidly or slowly adapting response?

A

Rapidly adapting

24
Q

Which type of mechanoreceptor?

Receptive field: Multiple small spots, high density in fingure tips, around mouth

Low density on back

A

Merkel disks

24
Q

What is the receptive field of Pacinian corpuscles?

A

large and diffuse

25
Q

Which type of mechanoreceptor?

Fine touch, 2-point discrimination; sharpest resolution of surface texture

Bumpy vs. smooth

A

Merkel disks

26
Q

Which nociceptors are polymodal (many modes)?

A

C polymodal nociceptors

28
Q

What is the rate code in relation to intensity of a stimulus?

A

Each neuron’s frequency of action potential firing

29
Q

Which receptors help determine shape of grasped objects?

A

Ruffini Endings

30
Q

A-Mechanonociceptors: myelinated or unmyelinated axons?

A

Myelinated

31
Q

True or false

Both A-Mechanonociceptors and C polymodal nociceptors have:

  • Free nerve endings
  • Small receptive fields
  • Slowly adapting responses
A

True

33
Q

Receptive field of warming receptors?

A

Very small receptive fields

34
Q

Which type of mechanoreceptor?

Most sensitive mechanoreceptor, even distribution throughout skin

A

Pacinian corpuscles

36
Q

Which type of mechanoreceptor?

Several disks innervated by a single myelinated axon

A

Merkel disks

37
Q

Which nociceptor responds to intense mechanical force and sometimes intense heat (>52 °C)?

A

A-mechanonociceptors

38
Q

Warming receptors: myelinated or unmyelinated axons?

A

Unmyelinated (C FIBER!)

39
Q

Do hair follicles have a slowly or rapidly adapting response?

A

Rapidly adapting response encodes velocity of hair momvement

Neuroanatomy (7 decks)

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