How Do Pathages Get Up Into the Brain?

i thought there were impulses that travelled up the nerve rather than molecules. So by using the vagal nerve, does it by patch the blood brain barrier? That's correct. One of the most straight direct shota up into the brain is the vagos nerve. A preon diseases like mad cawds are usually associated with consuming a tainted meat rit. But how does he get from eating the meat up to the brain? Well, once the meat gets inside of the digestive tract, then these prion like protins can enter this de circuetry and then lik travel up into the head.