Normal fetal development is dependent on adequate placental blood perfusion. The functional role of the placenta takes place mainly in the capillary system; however, ultrasound imaging of fetal blood flow is commonly performed on the umbilical artery, or on its first branches over the chorionic plate. The objective of this study was to evaluate the structural organization of the feto-placental vasculature of the chorionic plate. Casting of the placental vasculature was performed on 15 full-term placentas using a dental polymer mixed with colored ink. Observations of the cast models revealed that the branching architecture of the chorionic vessel is a combination of dichotomous and monopodial patterns, where the first two to three generations are always of a dichotomous nature. Analysis of the daughter-to-mother diameter ratios in the chorionic vessels provided a maximum in the range of 0.6-0.8 for the dichotomous branches, whereas in monopodial branches it was in the range of 0.1-0.3. Similar to previous studies, this study reveals that the vasculature architecture is mostly monopodial for the marginal cord insertion and mostly dichotomous for the central insertion. The more marginal the umbilical cord insertion is on the chorionic plate, the more monopodial branching patterns are created to compensate the dichotomous pattern deficiency to perfuse peripheral placental territories.

译文

正常的胎儿发育依赖于充足的胎盘血液灌注。胎盘的功能作用主要发生在毛细血管系统中; 但是,胎儿血流的超声成像通常在脐动脉或绒毛膜板上的第一个分支上进行。这项研究的目的是评估绒毛膜板的胎儿胎盘脉管系统的结构组织。使用与彩色墨水混合的牙科聚合物对15个足月胎盘进行胎盘脉管系统的铸造。对铸造模型的观察表明,绒毛膜血管的分支结构是二分和单足模式的组合,其中前两到三代总是二分的。对绒毛膜血管中子母直径比的分析提供了二分分支在0.6-0.8范围内的最大值,而在单足分支中,则在0.1-0.3范围内。与以前的研究相似,这项研究表明,脉管系统结构对于边缘脐带插入而言大多是单足的,而对于中心插入而言则是二分的。脐带插入绒毛膜板上的边缘越多,产生的单足分支模式就越多,以补偿二分模式的缺陷,以灌注外周胎盘区域。

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