Milenković Z, Vucetić R, Puzić M
Surg Neurol. 1985 Nov;24(5):563-70. doi: 10.1016/0090-3019(85)90275-7.
The arteries of the circle of Willis in fetal brains of 20-40 weeks of gestational age were studied with the operating microscope. The majority of fetuses were between 24-32 weeks of age. Our findings were as follows: 1) the average diameters of all segments were 4-5 times narrower than the average diameters in adults, and the average lengths of the same segments were 2-2.5 times shorter than the same lengths in adults; 2) the number of perforators corresponded with the perforating arteries in adults; 3) hypoplastic segments, as well as anomalies and variations, were identified; 4) calibers almost equal in size between the right and left corresponding segments were found in a high proportion of cases; 5) in the majority of cases a polygon, much like the "precarious" circle in adults, was dissected. The "fetal" or the "ideal" circles were found in a low proportion of cases.
使用手术显微镜对20至40周胎龄胎儿大脑的 Willis 环动脉进行了研究。大多数胎儿年龄在24至32周之间。我们的研究结果如下：1）所有节段的平均直径比成人的平均直径窄4至5倍，相同节段的平均长度比成人的相同长度短2至2.5倍；2）穿支数量与成人的穿支动脉相对应；3）发现了发育不全节段以及异常和变异情况；4）在高比例的病例中，左右相应节段的管径几乎相等；5）在大多数病例中，解剖出了一个多边形，很像成人的“不稳定”环。在低比例的病例中发现了“胎儿型”或“理想型”环。
