Ascending & Descending Pathways Flashcards

1
Q

Name the two main ascending tracts

A
  • Dorsal Column
  • Spinothalamic tract
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2
Q

What kinds of sensory information is transmitted through the dorsal column?

A
  • Fine touch
  • Two point discrimination
  • Vibration
  • Proprioception
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3
Q

Where does the first order neuron synapse with the second order neuron in the dorsal column?

A

Medulla Oblongata
The fibres also immediately decussate here

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4
Q

What part of the dorsal column transmits sensation for the lower body?

A

Fasciculus/Nucleus Gracilis

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5
Q

What part of the dorsal column transmits sensation for the upper body?

A

Fasciculus/Nucleus Cuneatus

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6
Q

For both of the ascending pathways where do the second order neurons synapse with third order neurons?

A

Thalamus

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7
Q

For both ascending pathways where do third order neurons travel?

A

Somatosensory complex in post-central gyrus

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8
Q

What is the medial lemniscus?

A

Term that describes the decussation of fibres in the dorsal column at the medulla oblongata

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9
Q

What sensations are transmitted via the lateral spinothalamic tract (LST)?

A
  • Pain
  • Temperature
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10
Q

What sensations are transmitted via the Anterior spinothalamic tract (AST)?

A
  • Crude touch
  • Pressure
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11
Q

Where do first order neurons from the lateral spinothalamic tract synapse with second order neurons?

A

substantia gelatinosa

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12
Q

Where do first order neurons from the anterior spinothalamic tract synapse with second order neurons?

A

Nucleus proprius

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13
Q

Name the descending tracts?

A
  • Corticospinal (pyramidal) tract
  • Tectospinal tract
  • Reticulospinal tract
  • Vestibulospinal tract
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14
Q

What is the function of the corticospinal tract?

A

Fine, precise movement especially that of distal limb muscles.

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15
Q

Where do the pyramids in the corticospinal tract form?

A

The medulla, This is also where 85% of the fibres decussate to form the lateral corticospinal tract

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16
Q

What name is given to uncrossed corticospinal fibres?

A

Ventral corticospinal tract

17
Q

What area is innervated by the Lateral corticospinal tract?

A

Limbs

18
Q

What area is innervated by the ventral corticospinal tract?

A

Trunk, neck & shoulders

19
Q

What is the tectospinal tract responsible for?

A

Mediation of head and neck movement

20
Q

What is the reticulospinal tract responsible for?

A

Mainly influence over voluntary movement

21
Q

Fibres from the medial (pons) part of the reticulospinal tract mediate what?

A

Extensor movement of trunk and limbs

22
Q

Fibres from the lateral (medulla oblongata) part of the reticulospinal tract mediate what?

A

Flexor movement of trunk and limbs

23
Q

What is the vestibulospinal tract responsible for?

A

Facilitating extensor muscles