Herewith some comments belonging to the lectures concerning finalizing the pain lecture

13 important questions on Herewith some comments belonging to the lectures concerning finalizing the pain lecture

What contributes to the inhibition of nociceptive stimuli?

A descending pathway joins with PAG (dorsolateral funiculus).

What activates the Gate Control Theory of pain?

Rubbing over the painful area activates A-Beta fibers that close the 'gate'.

Where do the olfactory nerves originate?

They originate from the olfactory mucosa.
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What connects the olfactory bulbs?

The medial olfactory stria connects the bulbs.

How are the lower visual fields transmitted?

Through Baum's loop to the occipital cortex.

What is a symptom of a lesion of the oculomotor nerve?

A blown pupil indicates intact sympathetic nervous system.

What activates the descending pathway that inhibits nociceptive stimuli?

Activating frontal networks can include:
  • Music
  • Physical activity
  • Good conversation
  • Playing chess

Where do two supraspinal pain suppression systems originate?

Two systems arise at:
  1. Reticular formation (locus coeruleus)
  2. Midbrain (PAG)

What does the Gate Control Theory of pain involve?

It involves:
  • Rubbing activates A-Beta fibres
  • Closes the 'gate' in spinal cord

Which cranial nerves are exclusively sensory?

CN I and CN II are:
  • Olfactory nerve (smell)
  • Optic nerve (vision)

Where do olfactory nerves project?

They project to:
  • Glomerulus in olfactory bulb
  • Connected by medial olfactory stria
  • Project into temporal lobe regions

What causes a drooping eyelid?

It can be due to:
  1. Lesion of oculomotor nerve (CN III)
  2. Lesion of sympathetic nervous system

What distinguishes oculomotor nerve lesions from sympathetic system lesions?

A big difference is:
  • Oculomotor nerve lesion shows a blown pupil
  • Sympathetic lesion shows pupil constriction

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