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neurology soh > Somatosensory System > Flashcards

Somatosensory System Flashcards

1
Q

What is proprioception?

A

Joint and muscle position in space

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2
Q

What is nociception?

A

Pain

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3
Q

What is pruriception?

A

Itch

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4
Q

What are the 3 divisions of the somatosensory system?

A

Exteroceptive division
Proprioceptive division
Enteroceptive division

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5
Q

Exteroceptive division - what is it?

A

Registers infromation from the surface of the body

Cutaneous senses

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6
Q

Proprioceptive division - what is it?

A

Monitors posture, movement

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7
Q

Enteroceptive division - what is it?

A

Closely related to autonomic function

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8
Q

The 1st/2nd/3rd order neurone is the primary sensory afferent ?

A

1st order neurone

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9
Q

Which order neurone (1st/2nd/3rd) starts at a peripheral site of the body ?

A

1st order neurone

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10
Q

Cell body of the 1st order neurone will be located where?

A

Dorsal root ganglion (innervation of limbs, trunk, posterior head)

OR

Cranial ganglia (innervation of anterior head)

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11
Q

The 2nd order neurone is located in the CNS. True or false?

A

True

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12
Q

Where is the cell body location of 2nd order neurone?

A

Dorsal horn of SC or

Brainstem nuclei

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13
Q

Where is the cell body location of 3rd order neurone?

A

Thalamic nuclei

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14
Q

Light pressure has a low/high action potential frequency ?

A

Low

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15
Q

What do mechanoreceptors detect?

A

Touch, pressure, vibration

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16
Q

Low threshold units respond to high intensity stimuli. True or false?

A

False

- low intensity stimuli

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17
Q

What do low threshold mechanoreceptors mediate?

A

Fine discriminatory touch

18
Q

High threshold units respond to nociceptors. True or false?

A

True

- extremes

19
Q

The greater the diameter of an axon, the lower/higher its internal resistance so the slower/faster the conduction

A

Greater diameter
Lower resistance
Faster conduction

20
Q

Which primary sensory afferent fibres have the largest diameter?

A

Proprioceptors

21
Q

Which primary sensory afferent fibres have the smallest diameter?

A

Temperature
Pain
Itch

22
Q

What is the receptive field ?

A

The territory from which a sensory unit can be excited.

23
Q

A large receptive field will have low/high density of innervation and low/high acuity ?

A

Low

Low

24
Q

A small receptive field will have low/high density of innervation and low/high acuity?

A

High

High

25
Q

Merkel cell neurone complexes is a sensory receptor of hairy/hairless/both skin and has a small/large receptive field ?

A

Hairless and hairy

Small receptive field

26
Q

Where are merkel cell neurone complexes located?

A

Areas with high sensory acuity (e.g. fingers)

27
Q

Meissner corpuscle is only ever found in hairy skin. true or false?

A

False

- only ever found in hairless skin (e.g. fingers)

28
Q

Pacinian corpuscle has a small/large receptive field and detects what?

A

Large

Deep vibration

29
Q

Name 3 sensory receptors of hairless and hairy skin ?

A

Pacinian corpuscle
Merkel cell neurone complexes
Ruffini endings

30
Q

Name 1 sensory receptor of purely hairless skin?

A

Meissner corpuscles

31
Q

As information is conveyed from one neurone to the next in a sensory pathway, differences in the activity of adjacent neurones are amplified. What is this called?

A

Contrast enhancement

32
Q

When one neurone is active, it inhibits the activity of its neighbours via inhibitors neurones. What is this called?

A

Lateral inhibition

33
Q

Somatic information from the anterior head is mediated by which system?

A

trigeminal system

34
Q

Where is the somatosensory cortex located?

A

Post central gyrus of the parietal cortex

35
Q

The somatosensory cortex is located immediately anterior/posterior to the central sulcus ?

A

Posterior

36
Q

The somatosensory system consists of Brodmann areas. True or false?

A

True

37
Q

How many layers does the somatosensory cortex have?

A

6 layers

38
Q

What does the homunculus illustrate?

A

How much cortex is devoted to a particular body part

39
Q 
Which body part is located at the medial part of the post central gyrus? 
Trunk
Face
Upper limb 
Lower limb
A

Lower limb

40
Q 
Which body part is located at the lateral part of the post central gyrus? 
Trunk
Face
Upper limb 
Lower limb
A

Face

41
Q

Which area of the brain receives and integrates information from the primary somatosensory cortex ?

A

Posterior parietal cortex

neurology soh (31 decks)

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