Источники закладки и периоды формирования пупочного канатика с использованием морфологических и эмбриональных методик. Понятие процессов эпителиально–мезенхимальных превращений. Особенности и условия образования рыхлой студенистой соединительной ткани.
МОРФОЛОГІЯThe umbilical coiling index / T. H. Jr. In the regulation of placental-fetal blood flow the pressure and volume of venous blood in the umbilical artery is dominated: while increasing venous pressure there is expansion of the capillary bed of the villi due to opening of new, previously slept capillaries and significantly increases the area of diffusion between mother and fetus. Progress in optimizing the development of the embryo and fetus defined study the structural characteristics of extraembryonic organs - chorion, amnion, yolk sac, embryo stem body with piercing in her allantois - future umbilical cord In the regulation of placental-fetal blood flow the pressure and volume of venous blood in the umbilical artery is dominated: while increasing venous pressure there is expansion of the capillary bed of the villi due to opening of new , previously slept capillaries and significantly increases the area of diffusion between mother and fetus . Since the umbilical cord is an integral part of the mother - placenta - fetus system, then the sources and mechanisms underlying the development of the placenta in early embryogenesis, have a common basis for the formation of the umbilical cord. Then allantois, remnants of the yolk bubble, umbilical vessels converge and form a cord , coated outside the amnion with epithelium and relating the embryo and fetus to the wall of the chorion, and then placenta.
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