[Cardovascular C1 and C2]

I've only seen C1 C2 as in the c spine at the top-

but there is the vertebral artery that runs down the spine & it can get pinched/affected.

http://www.meddean.luc.edu/lumen/med...on/vertbas.htm
http://images.google.com/imgres?imgu...%3Den%26sa%3DN