Somatosensory 2 Flashcards

1
Q

What is the fibre class of the dorsal column medial lemniscus pathway?

A

Aa/Ab

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2
Q

What modalities does the dorsal column medial lemniscus pathway carry?

A

fine touch, pressure, vibration and conscious proprioception

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3
Q

What modalities does the spinothalamic tract carry?

A

pain; thermosensation; crude touch, itch and tickel

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4
Q

What are hte fibre classes of spinothalamic tract?

A

Ad/C

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5
Q

What levels of the spinal cord travel in the fasciculus gracilis?

A

T6 and below

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6
Q

How are the areas of the spinal cord arranged in the dorsal column?

A

upper is lateral to lower medial

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7
Q

What do second order neurones of the DCML cross in?

A

the great sensory decussation

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8
Q

What nucleus do the second order neurones synapse within?

A

ventral posteriolateral nucleus of the thalamuc

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9
Q

How do the thrid order neuones of the DCML travel to S1?

A

posterior internal capsule

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10
Q

What is sterognosis?

A

ability to recognise an object by feeling it

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11
Q

What is contrast enhancement?

A

the amplification in the differences in the activity of adjacent neurones at synapses

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12
Q

How is contrast enhancement acheived?

A

lateral inhibition by inhibitory interneurones

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13
Q

Where are the soma of trigeminal sensory neurones located?

A

in the trigeminal sensory ganglion

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14
Q

What modality synapses in the chief trigeminal sensory nucleus

A

general tactile stimuli

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15
Q

What modalities synapse in the spinal nucleus?

A

pain, temperature

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16
Q

How do second order neurones of the trigeminothalamic pathway reach the thalamus?

A

via the trigeminal lemniscus

17
Q

What nucleus do the second order neurones of hte trigeminothalamic pathway synapse within?

A

ventroposteriormedial nucleus of thalamuc

18
Q

How do thrid order neurones of the trigeminothalamic pathway relay info to the cortex?

A

via the thalamocortical neurones

19
Q

What is the input to Brodmann’s area 3a?

A

proprioception

20
Q

What is the input to Brodmann’s area 3b?

A

cutaneous SA and RA receptors; BA 3a

21
Q

What is the input to Brodmann’s area 1?

A

cutaneous RA mechanoreceptors, BA 3a

22
Q

What is the input to BA2?

A

joint afferents; golgi tendon organs, deep tissues, BA3a and BA 3b

23
Q

What is the modality to BA3b?

A

touch- texture, shape and stimulus size

24
Q

What is the modlaity to BA1?

A

texture discrimination

25
Q

what is the modality to BA2?

A

object perception- stereognosis

26
Q

What are the Brodmanns areas from anterior to posterior?

A

3a–3b–1–2

27
Q

What separates the head from the face in the priamry somatosensory cortex?

A

the hand

28
Q

How many cell layers are there in the somatosensory cortex?

A

6

29
Q

What cell layer do thalamic inputs to S1 terminate?

A

layer IV

30
Q

How are the multiple somatotopic maps in the S1 arranged?

A

in parralel and mirror image