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.
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.
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。
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