circle of Willis; arterial circle of Willis
Anatomical term for the arterial anastomosis at the base of the brain. Used in medical and biological contexts.
The circle of Willis is an arterial circle at the base of the brain.
occlusion in the circle of Willis
Named after the English physician Thomas Willis (1621–1675). The Japanese term combines the katakana rendering of his name with 動脈輪 (arterial circle).