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Analysis of urea in the tissues of the chorion and allantois of the epitheliochorial placenta


Analysis of urea in the tissues of the chorion and allantois of the epitheliochorial placenta



Izv Sibirsk Otd Akad Nauk Sssr Ser Biol Med Nauk 3: 133-136



Large amounts of urea were found in the tissues of the allantois and chorion of the pig embryo. The presence of urea in the chorion (in the epithelium and connective tissue) indicates that this membrane has an important excretory function in embryos with epitheliochorial placentas. The significant amount of urea found in the connective tissue base of the allantois verifies its predicted active role in the excretory process of embryos with epitheliochorial placentas. It is believed that urea diffuses through the walls of the allantois into allantoic vessicle; data obtained in a study of mucopolysaccharides in the stroma of the allantois indicates that conditions for this process of excretion are more favorable in the second half of pregnancy. Urea was also found in cells of the allantoic epithelium. This possibly reflects a means of excretion through the allantoic epithelium.

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