The posterior communicating artery is located in the back of the head at the back end of the circle of Willis. The circle of Willis is a band of arteries at the base of the brain that connects the ...

If you've had an ultrasound, you may have learned that there's fluid in your cul-de-sac area, which is behind the vagina. A small amount of clear fluid in the cul-de-sac is normal, but pus, blood, and ...