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South College Clinical Neuroscience > Week 1: Pathways- Spinothalamic > Flashcards

Week 1: Pathways- Spinothalamic Flashcards

1
Q

What’s another name for the spinothalamic tract?

A

Anterolateral pathway

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2
Q

What information does the spinothalamic tract process?

A
  • Coarse/crude touch
  • Temperature
  • Discriminative pain
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3
Q

Where does decussation occur in the spinothalamic tract?

A

At the level of the neuron where the stimulus occurs

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4
Q

What kind of axons transmit coarse/crude touch?

A

Unmyelinated C fiber axons

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5
Q

Where does crude/coarse touch project?

A

Left insula

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6
Q

What kind of sensation is crude/coarse touch?

A
  • Less localized
  • Pleasurable touch/skin-to-skin
  • Tickle/itch
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7
Q

What kind of nerves detect temperature?

A
  • Specialized free nerve endings

- Small myelinated and unmyelinated neurons

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8
Q

What fibers specifically carry cooling info?

A

A-delta fibers

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9
Q

What fibers specifically carry heating info?

A

C fibers

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10
Q

What is pain?

A
  • Sensation that triggers autonomic psychological, and somatic motor responses
  • Composed of both perceptual and emotional experiences
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11
Q

What does pain sensation interpret stimuli as?

A

Stimuli is interpreted as indicating current or impending tissue damage

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12
Q

Components of pain

A
  • Fast pain

- Slow pain

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13
Q

Fast pain

A
  • Spinothalamic

- Rapidly conducted by large-diameter myelinated axons

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14
Q

Slow pain

A
  • Spinolimbic

- Slowly conducted by smaller, less heavily myelinated axons

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15
Q

1st order neuron for fast, localized pain

A
  • Small, myelinated A-delta fiber

- DRG ➙ dorsal horn

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16
Q

2nd order neuron for fast, localized pain

A

Crosses midline immediately and ascends from spinal cord to VPL of thalamus within spinothalamic tract

17
Q

3rd order neuron for fast localized pain

A

Thalamus ➙ primary & secondary sensory cortex

18
Q

Which nerve transmit pain info for the face?

A

Trigeminal nerve

19
Q

1st order neuron for face pain

A

Fibers enter pons and travel down to trigeminal nerve nucleus in medulla/upper cervical region

20
Q

2nd order neuron for face pain

A
  • Medulla –> thalamus

- Crosses midline to ascend back up to VPM nucleus of thalamus

21
Q

3rd order neuron for face pain

A

Thalamus to cerebral cortex

22
Q

Crossed analgesia

A
  • Ipsilateral analgesia in the face

- Contralateral analgesia in the body

South College Clinical Neuroscience (52 decks)

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