recti

1.The vascular plexus at the lower part of the villi had the characteristics of recti mini vessels and protal vesselas.

绒毛下部血管表现为微血管形态，可能部具有门静脉性质。

2.The role of recti mini vessels connecting the cryptal plexus with the villi plexus was an ″collateral circulation″ to supply the base of the villi where the arterial termination was lacking.

③联系腺丛与绒毛血管丛的微血管向缺少动脉终末支的绒毛基底部供血，主要起到“侧副循环”的作用。