Vessel Cavity Research Articles

1) As the conclusion of our observations, we add the following facts to the electron microscopic report of the human placenta by Wislocki and Dempsey (1955).a) In syncytiotrophoblast are observed cell-gaps and a double membrane structure.b) The syncytial cells and Langhans' cells are conjugated with one another by a cement substance.c) In the syncytiocytoplasm are found substances like Golgi canal or sac.d) The fetal capillary walls are built up stratiform by the endothelial cells, and the four connected parts of cells are observed in the blood vessel cavity.2) With the electron microscope many microvilli of various types are observed on the brush border of syncytialtrophoblast. This seems to exert an influence upon the absorption of materials from maternal blood.3) The placental membrane is, as Hamilton says, composed of the four layers, but the exchange of substances is carried on in the three layers excepting cytotrophoblast.4) The osmiophil granules of syncytial cytoplysm have a close connection with steroid hormones. The research in the process of the development of these granules would give an important clue in elucidating the process of the secretion of the hormones.

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