After a week of menstrual cessation, one may think of pregnancy. Going to the hospital for examination can check the yolk sac to estimate the size of the fetus. The yolk sac is very important to the fetus and coexists with fetal heart rate and other factors. So many pregnant women are more concerned about the size of the yolk sac. Is it normal for the yolk sac not to disappear? Let's learn about it together with the editor below.
Is it normal for the yolk sac not to disappear
In clinical practice, the yolk sac can coexist with the gestational sac. Some pregnant women gradually lose the yolk sac on their own, but there are also some pregnant women whose gestational sac grows and the yolk sac will also grow along with it.
Before embryonic maturation, the yolk sac is responsible for transporting nutrients to the egg sac, serving as a transport system between the embryo and the mother. It has functions such as nutrition, hematopoiesis, metabolism, and immunology. On the fifth weekend of pregnancy, the yolk nest will detach from the original intestine and gradually regress. Until the 7th week, it became a small sac with a diameter of less than 5 millimeters, existing on the surface of the embryo. This is also a phenomenon that occurs in the replay system.
The relationship between fetal heart, fetal bud, and yolk sac
Generally speaking, behind the yolk sac is the development of the embryo, that is, the gestational sac begins to develop, the yolk sac gradually develops, and the embryo develops into a embryo. Afterwards, the embryo undergoes fetal heart development, which is a developmental process. After each organ gradually forms, it is called an embryo before the 8th week of pregnancy. In the fourth week, the blastocyst has firmly implanted into the uterus.
At the same time, prototypes of the fetal nervous system and blood circulation organs have almost emerged. Since then, the liver has developed rapidly and has not yet produced prototypes for the eyes and nose, but prototypes for the mouth and chin can be seen. Usually, fetal buds can be seen on ultrasound at 6 to 7 weeks of pregnancy. Due to the development of the embryo, the formation of the fetal capsule takes 30 to 40 days, the formation of the fetal bud takes 40 to 50 days, and the formation of the fetal heart takes 50 to 60 days, so it should usually be completed within about 60 days.
Is it normal for the yolk sac to not disappear? It has been briefly introduced above. In fact, the yolk sac is the source of nutrients for the lung yolk sac, but it gradually recedes on its own afterwards. Pregnant women should not worry, as there are some that do not disappear. Fetal heart rate, fetal pressure, and yolk sac are all very important, and these connections are inseparable. As long as prenatal checkups are done regularly, there will be no problems.
