微动脉在绒毛顶部与微静脉有交通支，构成动静脉吻合。
At the tip of the villus, arterioles send out one branch to form an arteriovenous anastomosis with the vein.
绒毛微动脉在顶部与绒毛微静脉有交通支，形成毛细血管前动静脉吻合。
There were connecting vessels between the villi arteriole and the villi venule at the tip of the villi, and they form a precapillary arteriovenous anastomosis.
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