BRAIN BLOOD FLOW AND METABOLISM
It occurred to my former PhD advisor (Roger Seymour, University of Adelaide) that if you know the size of a vessel, then you ought to be able to calculate the rate of blood flow through that vessel, and when that vessel is transmitted snugly through a bony canal, then all you need to know is the size of the canal. Here are the carotid foramina (arrows) that provide passage for the internal carotid arteries to the brain. Using this principle, we have calculated blood flow rates to the brain across three-million years of human evolution.