Interestingly, the arteries and veins surrounding the brain stem come together to form a system known as the “Circle of Willis.”
The system looks like a stick person with a large head.
This website shares this:
The Circle of Willis is truly one of the most important, yet overlooked areas in the brain, and one of the most efficiently designed systems in the human body.
While it does not specifically help one to think or react, per se, the more glamorous portions of the brain could not possibly function without the Circle.
The entire supply of blood to the brain is efficiently supplied by these arteries, and if one thinks that it’s not important to have a good supply of blood to the brain, a victim of a stroke will surely be able to explain otherwise (a stroke occurs when the blood supply to the brain is temporarily interrupted).