Surface morphology of the human yolk sac : Endoderm and mesothelium.
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概要
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The yolk sac of human embryos from the 5th to 7th week of gestation was first revealed under the scanning electron microscope (SEM) with complementary observations under the transmission electron microscope (TEM). The inner and outer surfaces of the human yolk sac basically showed profiles similar to those of other mammalian yolk sacs reported by previous workers. The free surface of the endodermal cell measured 10-15μm in diameter and was only slightly swollen in its earlier stages, possessing microvilli of 100-600nm in length. On the other hand, the outer surface of mesothelial cells was swollen, but much smaller in size (8-10μm). The mesothelial microvilli were much longer than those of the endoderm, measuring about 1.5μm in length. On the endodermal surface, ruffles and various sizes of holes with short microvilli were occasionally found. The latter became larger with development, and seemed to be continuous with the endodermal tubules.
- 国際組織細胞学会の論文
国際組織細胞学会 | 論文
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