the Bear SG darn.. shoulda kept that comic... about Bloom and Bana turning into Legolas and The Hulk..
renorenal SG Very hard to specify the main and minor lor... if we really talking MAIN arteries from outside the brain feeding into the brain, then only 2... the internal carotids (branches out to form the anterior and middle cerebral arteries) and the vertebral arteries (branches out to form the posterior cerebral artery)...
the Bear SG in fighting, you block them along with the windpipe, you block the carotid triangle... which is why such holds or chokes are called "Triangle Chokes" as doctors, those who use their knowledge for these things, are the most deadly martial artists