Kamath S
J Anat. 1981 Oct;133(Pt 3):419-23.
The dimensions of vessels forming the circle of Willis were studied in 100 fixed brains from cadavers. The coefficient of variation for length was greatest for the anterior communicating artery, and that for diameter was greatest for the posterior communicating artery. Abnormally narrow diameter occurred in 25 vessels of 24 circles and was most frequently seen in the posterior cerebral (11) and posterior communicating arteries (10). A significant inverse relationship existed between the diameters of the posterior cerebral and posterior communicating arteries of the same side. The left cerebral hemisphere appeared to enjoy a better blood supply.
对100个来自尸体的固定大脑中构成Willis环的血管尺寸进行了研究。前交通动脉长度的变异系数最大，而后交通动脉直径的变异系数最大。24个Willis环中的25条血管出现异常狭窄，最常见于大脑后动脉（11条）和后交通动脉（10条）。同一侧大脑后动脉和后交通动脉的直径之间存在显著的负相关关系。左侧大脑半球似乎血液供应更好。
