circle of Willis necklace | silver pp_cardio we would not know there

we would not know there are other galaxies

and as a thank-you from teams to surgeons they have worked with

and a gap of about 100 million years in the evolutionary record between RNA-based and DNA-based information storage

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circle of Willis necklace | silver pp_cardio we would not know thereCircle of Willis necklace sterling silver If you have trained on stroke protocols, you know the circle of Willis before you know most other brain anatomy. The arterial ring at the base of the brain that provides collateral perfusion when one vessel is blocked. Thomas Willis described it in 1664, and it remains the key to understanding why some strokes are catastrophic and others are survivable. The Science Behind the Circle of Willis The circle of