Placental vascular corrosion cast studies: A comparison between ruminants and humans
Placental vascular corrosion cast studies: A comparison between ruminants and humans
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胎盘血管腐蚀铸型研究：反刍动物与人类的比较
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
V. Dantzer
中科院分区：
文献类型：
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作者：
R. Leiser;C. Krebs;Brigitte Ebert;V. Dantzer
利用血管铸型和扫描电子显微镜对牛、绵羊和山羊的反刍动物胎盘和人胎盘的微血管进行了比较。反刍动物和人类胎盘的胎儿血管树在形式和大小上不同，这与分支的程度相关;然而，它们的茎、中间和末端绒毛的结构相似。人的终末绒毛的串联毛细血管曲系统比反刍动物的长。因此，在保证血液流动抵抗流动阻力时，人体血管特别需要直线、弯曲和正弦扩张。特别是在研究的反刍动物中，静脉血管的体积和数量超过动脉血管。它们被认为是在毛细血管复合物区代谢的物质的吸收。最极端的种间差异与母体脉管系统有关，与胎儿系统相反，母体脉管系统在反刍动物隔膜中是封闭系统，在人类中是开放的腔隙绒毛间隙。反刍动物和人类胎盘的收敛和不同形态的血管现象进行了讨论的母胎交换有关的胎盘效率。总之，反刍动物胎盘，涉及胎儿血管树，在许多方面是可行的，作为一个模型的人。Microsc. Res. Tech. 38：76-87，1997.© 1997 Wiley利斯公司
The microvasculature of both the ruminant placentomes of cattle, sheep, and goats and the human placenta were compared, using corrosion casts of blood vessels and scanning electron microscopy. The fetal vascular trees of ruminant and human placenta differ in form and size, which correlates with the degree of ramification; however, their architecture of stem, intermediate, and terminal villi is similar. In the human, the system of serially linked capillary convolutions of terminal villi is longer than that in ruminants. Therefore, in guaranteeing blood flow against flow resistance, the human vessels particularly need a straight course, anastomoses, and sinusoidal dilations. Specifically in the ruminants studied, the venous vessels outweigh the arterial ones by volume and by number. They are suggested to be absorptive for substances metabolized in the zone of the capillary complex. The most extreme interspecies difference relates to the maternal vasculature, which, in contrast to the fetal system, is a closed system in the ruminant septas and an open lacunal intervillous space in the human. Converging and differing morphological vascular phenomena of ruminants and human placenta are discussed in terms of maternofetal exchange related to placental efficiency. In summary, the ruminant placenta, concerning the fetal vascular tree, in many aspects is workable as a model for the human. Microsc. Res. Tech. 38:76–87, 1997. © 1997 Wiley‐Liss, Inc.