Development of the intercaruncular areas during early gestation and establishment of the bovine placenta.
Development of the intercaruncular areas during early gestation and establishment of the bovine placenta.
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妊娠早期和牛胎盘形成期间肉阜间区域的发育。
DOI：
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发表时间：
1981
期刊：
影响因子：
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通讯作者：
H. Robertson
中科院分区：
文献类型：
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作者：
G. J. King;B. A. Atkinson;H. Robertson
在妊娠第17、18、20至30天以及直至第45天每隔3天从小母牛子宫中采集标本，并通过光学显微镜、透射和扫描电子显微镜检查该材料。第18天子宫上皮高度降低是首次可检测到的母体对腔内存在囊胚的反应。到第20天，滋养层可以保持与子宫上皮接触，并且在第21天和第30天之间，附着变得越来越复杂。附件同时发生在近胚胎的胚管间和胚管区域，随后向胚泡的每一端扩散。在第22天之前，子宫上皮中存在无颗粒白细胞，但在以后的标本中几乎完全不存在。
Specimens were obtained from the uteri of heifers on Days 17, 18, 20 to 30 and at 3-day intervals up to Day 45 of gestation and this material was examined by light microscopy, transmission and scanning electron microscopy. A reduction in height of the uterine epithelium on Day 18 was the first detectable maternal response to the presence of the blastocyst within the lumen. The trophoblast could be preserved in contact with the uterine epithelium by Day 20 and the attachment became progressively more complex between Days 21 and 30. Attachment occurred simultaneously in the intercaruncular and caruncular regions near the embryo and subsequently spread towards each end of the blastocyst. Agranular leucocytes were present in the uterine epithelium until Day 22 but were almost totally absent in later specimens.