So I've read that upper-cervical creates inflammation, which in turn pinches arteries in the neck and thereby restricts blood flow to the brain. If this is the case; does it cause death of neurones or does it only temporary impair the brains function?

I found some information on this that might be helpful.

Since I can't post links: If you search: "cerebral circulation" on wikipedia and scroll down to "Physiology" you see that:

-Normal blood flow is 50 to 54 millilitres of blood per 100 grams of brain tissue per minute.

-Too little blood flow (ischemia) results if blood flow to the brain is below 18 to 20 ml per 100 g per minute.

-Tissue death occurs if flow dips below 8 to 10 ml per 100 g per minute.

So to what extent is the blood flow restricted in the event of an inflammation in the upper cervical region?