Willis looks like you can see there's a whole bunch of blood vessels that come together to make this circle we can take pictures of that to try to understand when somebody's having stroke what other blood vessels are going to be available to help out okay so let's get into the symptoms the symptoms depend on what part of the brain is involved symptoms of a stroke are much more complicated than symptoms of a heart attack if we're talking about the stroke that is due to blood clots we refer to that as a scheme 'extra which means