Somatosensory system 2 Flashcards

1
Q

Dorsal column medial leminscal (DCML) pathway is responsible for what?

A

Discriminatory touch
Pressure
Vibration
Conscious proprioception

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2
Q

Which pathway is responsible for discriminatory touch, pressure, vibration and conscious proprioception?

A

Dorsal column medial leminiscal pathway

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3
Q
Crude touch
Itch
Tickle
Pain
Thermatosensation
A

Spinothalamic tract

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4
Q

The gracile tract and the cuneate tract make up what?

A

The dorsal columns

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5
Q

Sensory input above T6 travel in which tract? i.e. arms and upper trunk

A

Fasciculus cuneatus (cuneate tract)

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6
Q

Sensory input to T6 and below travels in which tract? i.e. legs and lower trunk

A

Fasciculus gracilis (gracile tract)

this tract runs the length of the spinal cord

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7
Q

V1

A

Opthalmic

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8
Q

V2

A

Maxillary

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9
Q

V3

A

Mandibular

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10
Q

Brodmann area 3a responsible for what?

A

Body position

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11
Q

Brodmann area 3b responsible for what?

A

Touch (texture, shape, stimulus size)

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12
Q

Lesion in Brodmann area 3b would result in what?

A

Deficits in texture, shape, discrimination

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13
Q

Brodmann area 1 responsible for what?

A

Texture discrimination

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14
Q

Lesion in Brodmann area 1 would result in what?

A

Loss of texture dicrimination

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15
Q

Brodmann area 2 responsible for what?

A

Object perception (size, shape of object - stereognosis)

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16
Q

Lesion in brodmann area 2 would result in what?

A

Impaired grasping and size and shape discrimination (asterognosis)

17
Q

What is astereognosis?

A

The inability to identify an object by touch of the hands without other sensory input

18
Q

What is the SI?

A

Somatosensory cortex

19
Q

What is the SII?

A

Posterior parietal cortex

20
Q

How many layers in the somatosensory cortex?

A

6 layers

21
Q

Thalamic inputs to the somatosensory cortex terminate mainly on neurones in which layer?

A

Layer IV

22
Q

There are also columns in the somatosensory cortex - how are they arranged?

A

Each column consists of neurones with similar inputs and responses

23
Q

What do adjacent strips of the cortex map, map?

A

Adjacent strips of cortex, map the same parts of the body in parallel to each other

24
Q

The maps are not identical but ______ of each other?

A

The maps are not identical, but mirror images of each other

25
Q

What happens if e.g. a finger is lost in an accident/amputated, what happens to the area of the central sulcus that previously represented that finger?

A

It becomes utilised by other sensory inputs

(e.g. will respond to stimulation of the adjacent digits and their cortical representation expands into the territory formerly representing that finger)

26
Q

Function of the posterior parietal cortex?

A

Receives and integrates information from the somatosensory cortex and other cortical areas:
-visual, auditory
and sub-cortical areas:
-thalamus

27
Q

This part of the brain receives and integrates information from the somatosensory cortex and other cortical areas (visual, auditory) and other sub-cortical areas (thalamus)

A

Posterior parietal cortex

28
Q

Damage to the posterior parietal cortex causes what?

A

Causes bizarre neurological disorders!
-e.g. agnosia, asterognosia, hemispatial neglect syndrome
With simple sensory skills remaining intact