circle of Willis necklace | silver gold_plated The same way one asks

The same way one asks for a hoover or a xerox

Pulmonologists

If you have ever solved a peptide structure

A traditional vertebral body would have made the atlas mechanically simpler but would have prevented the head from rotating

circle of Willis necklace | silver gold_plated The same way one asksCircle 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