Named after English physician Thomas Willis, t…

Named after English physician Thomas Willis, this cerebral arterial
circle is a schematic of arteries within the brain and brain stem, illustrating blood
flow. The complex and intricate form of the arteries presents build in redundancy
within our brains. If a part of the “circle” becomes blocked or narrowed… or arteries
supplying blood to a part of the system become narrowed, blood flow from other
areas can compensate, preserving function and preventing the loss of oxygen to the
While visually stunning, this standard orientation has been documented to be present
in less than 40% of individuals. After hundreds of examined cases, the “loop of Willis”
has extraordinary anatomic variation from person to person.
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Picture by @vegan.dy