Abstract
Abstract A general description of the ultrastructure and the cytochemical properties with reference to the chorionic syncytium of normal human placentae in early pregnancy is presented. Secretory granules, which are periodic acid-Schiff reaction positive, are described along with the electron microscope findings. The evidence that suggests the origin of secretory granules is from Golgi apparatus and that their liquefaction into the maternal blood stream occurs through the absorptive surface. The endocrinological significance of the secretion granule as possible human chorionic gonadotrophin is discussed.
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