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
brain.
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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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