Baeckeland E, Heinen E
Bull Assoc Anat (Nancy). 1979 Mar;63(180):59-67.
With the aid of scanning electron microscopy the normal pattern of both faces of amnion and visceral yolk sac were described. The inner face of the amnion turned towards the amniotic cavity is overlaid by large pavimentous cells bearing numerous microvilli. The opposite face, which delimits the exocoelome, consists of flattened fibroblasts separated by a fundamental connective substance. The two faces of the visceral yolk sac also show very different patterns. The exocoelomic face is covered by pavimentous cells ; these are smaller and bear less microvilli than amniotic cells. The yolk sac endoderm appears built up with prismatic or cubic cells, whose apical part is bulging and possesses a dense covering of microvilli. Amniocentesis effects are then reported. This intervention seems to provoke fetal membrane modifications only after 15 hours. These modifications essentially concern the visceral yolk sac whose exocoelomic cells are covered by more numerous microvilli which may show an intensification of a secretory process.
借助扫描电子显微镜描述了羊膜和脏卵黄囊两面的正常形态。朝向羊膜腔的羊膜内面覆盖着带有大量微绒毛的大扁平细胞。界定体腔外的另一面由被基本结缔组织分隔的扁平成纤维细胞组成。脏卵黄囊的两面也呈现出非常不同的形态。体腔外面覆盖着扁平细胞；这些细胞比羊膜细胞小，微绒毛也较少。卵黄囊内胚层似乎由棱柱形或立方形细胞组成，其顶端部分凸起，并有密集的微绒毛覆盖。接着报告了羊膜穿刺术的影响。这种干预似乎仅在15小时后才会引起胎膜改变。这些改变主要涉及脏卵黄囊，其体腔外细胞被更多的微绒毛覆盖，这可能表明分泌过程增强。
