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Control and Movement Term 2 > Ascending Sensory Pathways 1 > Flashcards

Ascending Sensory Pathways 1 Flashcards

1
Q

What type of information does the spinothalamic pathway carry?

A

Pain
Temp
Touch

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2
Q

What type of information does the dorsal column pathway carry?

A

Touch
Vibration
Pressure
Proprioception

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3
Q

What are the two groups that somaesthetic modalities fall into and which pathway belongs to which group?

A

Essential to survival - STT

Those that increase detail - DCP

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4
Q

What are the characteristics of the fibres in the DCP?

A

Large diameter

Heavily myelinated so fast conduction

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5
Q

What are the characteristics of the fibres in the STT?

A

Thin

Poorly myelinated or unmyelinated so slow conduction

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6
Q

What is a pseudounipolar neruron?

A

A neutron with a single stalk that splits to give off two processes

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7
Q

How many neurons make up the general sensory pathways?

A

3: first, second and third order

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8
Q

Where do the cell bodies of 1st order neurons reside?

A

DRG

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9
Q

Does the DRG belong to the CNS or PNS?

A

PNS

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10
Q

Which cell bodies reside in the CNS Ipsilateral grey matter?

A

Cell bodies of 2nd order neurons

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11
Q

What do the axons of 2nd order neurones do?

A

Cross the midline and ascend to the thalami

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12
Q

Where do cell bodies of 3rd order neurones reside?

A

Thalamus

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13
Q

Where do the axons of third order neurons project?

A

Somatosensory Cortex

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14
Q

Which lobe is the post central gyrus located in?

A

Parietal

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15
Q

What comprises the Dorsal Column?

A

Gracile and Cuneate Fasiculi

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16
Q

What happens to STT fibres BEFORE they contact secondary neurons?

A

They ascend 1-2 segments

17
Q

Where does the synapse between primary and secondary neurons, in the STT, occur?

A

In the dorsal grey horn

18
Q

Where does the secondary axon cross in the STT?

A

Crosses the midline in the ventral white commisure

19
Q

Which regions of the spinothalamic tract, medial to lateral, receive sensory input from which regions of the body?

A

Medial: Arm
Trunk
Lateral: Leg

20
Q

What is the region called in which the STT fibres ascend to the thalamus?

A

Spinal or Lateral Lemniscus

21
Q

Which pathway contains fibres which ascend contra laterally?

A

STT

22
Q

Which pathway contains fibres which ascend ipsilaterally?

A

DCP

23
Q

What is the significance of T6 in the anatomy of the DCP?

A

Sensory input above T6 synapses in the cuneate fascicle

Sensory input below T6 synapses in the gracile fascicle

24
Q

Which brainstem level do the fibres of the DCP cross the midline?

A

Closed Medulla

25
Q

What is the name given to the fibres which cross the midline in the DCP?

A

Internal arcuate fibres

26
Q

What do fibres ascend in towards the thalamus in the DCP?

A

The medial lemniscus

Control and Movement Term 2 (9 decks)

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