W2:S5 - Sections of Spinal Cord Flashcards

1
Q

Which part of the spinal cord is this from?

A

Thoracic

  • Thin grey and white matter area
  • Long dorsal horn
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2
Q

What part of the spinal cord is this from?

A

Cervical

  • Note the cervical enlargement of grey matter BUT
  • Large amount of white matter too
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3
Q

What part of the spinal cord is this from?

A

Lumbar

  • Note the enlarged grey matter from the lumbar enlargement
  • Much more grey matter than white matter
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4
Q
A
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5
Q

What causes the enlargement of the grey areas in the dorsal horns of the cervical and lumbar areas?

A
  • Limbs
  • Dorsal horns are motor fibres
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6
Q

What does the dorsal column medial lemnisal pathway carry?

A
  • Fine touch
  • Vibration sense
  • Proprioreception
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7
Q

How many neurones are there in a pathway in the dorsal medial lemniscus pathway?

A

3

First order

Second order

Third order

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8
Q

Where do first order neurones from the upper limb travel in the dorsal medial lemniscus pathway?

A

The fasciculus cuneatus

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9
Q

Where do signals from the first order neurones of the upper limb synapse?

A

Nucleus cuneatus

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10
Q

Where do first order neurone signals from the lower limb travel in the dorsal medial lemniscus column?

A

Fasciculus gracillis

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11
Q

Where do signals from the first order neurones of the lower limb synapse?

A

Nucleus gracillis

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12
Q

What is the pathway of second order neurones in the dorsal column medial lemniscus pathway?

A

Arise in nucleus gracillis and nucleus cuneate

  • Decussate in the medulla
  • Travel up in the controlateral medial lemniscus
  • They synapse in the posterolateral nuclei in the thalamus
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13
Q

Where do third order neurones travel in the DCML?

A
  • arise in posterolateral nuclei of the thalamus
  • Travel to the ipsilateral primary somatosensory cortex through the internal capsule to form the sensory homunculus
  • Remember they have already crossed over
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14
Q

Summary of DCML tract

A
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15
Q

What fibres travel in the antermedial spinothalamic tract?

A

Sensory

  • Crude touch
  • Pressure
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16
Q

What fibres travel in the lateral spinothalamic tracts?

A

Pain

Temperature

17
Q

Where do first order neurones travel in the anterior and lateral spinothalamic tracts?

A

From the area of sensation

  • Enter the dorsal horn and synapse in the substantia gelatinosa
18
Q

What happens to the second order neurones in the medial and lateral spinothalamic tracts?

A

arise from substantia gelatinosa

CROSS OVER at the level of entry

Ascend all the way up to the thalamus where they synapse

19
Q

Course of 3rd order neurones in spinothalamic tracts?

A

Thalamus to sensory cortex through the internal capsule

20
Q

Summary of spinothalamic tracts

A