Pregnancy does not grow yolk sac how to return a responsibility

summary

Pregnancy is not long, yolk sac often appears in our life, women during pregnancy, in the ovary will check the yolk sac, so the cause of this disease is also diverse, no matter what kind of disease, must be treated in time, so, what role does pregnancy yolk sac play? Yolk sac is a transport system connecting the embryo and mother's body. If yolk sac is not detected during pregnancy test, we should be alert to the problem of pregnancy arrest. Let's introduce the function of yolk sac.

Pregnancy does not grow yolk sac how to return a responsibility

The first is that the yolk sac is formed after the folding of the embryogenesis body, and the gastrium is obviously divided into the inner gastrium and the outer yolk sac. There is a large amount of yolk in the yolk sac. The wall of the yolk sac is formed by the outer endoderm and the outer mesoderm. When the yolk sac is seen, it means that the embryo is normal. The yolk sac is the most important transport system between the embryo and the mother.

Second: the appearance of yolk sac in gestational sac is normal. If there is no yolk sac, pregnancy may stop. For example, having a yolk sac is like having a house built and waiting for people to live in. After pregnancy, the yolk sac can be detected in the first 35 days of pregnancy. With the yolk sac, there will be embryo bud and fetal heart within 1-2 weeks. B-ultrasound can see it. Generally, ordinary instruments can see it clearly.

Third: it's normal to see yolk sac in the sac. Only yolk sac can develop into fetal bud and fetal heart. After somatic fold of yolk sac embryogenesis, the gastrium is obviously divided into the inner gastrium and the outer yolk sac, which contain a large amount of yolk. The wall of yolk sac is formed by the outer endoderm and the outer mesoderm. A membranous sac with abundant blood vessels located in the ventral part of the embryo and surrounded by the yolk. The tight part connected with the midgut of embryo body is called yolk sac stalk. The cyst wall is composed of the inner ectoderm and the outer ectomesoderm. The eggs of reptiles and birds are rich in yolk, and the yolk sac is large, which can store, decompose, absorb and transport nutrients.

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With the growth of embryo body, the yolk is consumed continuously, the yolk sac shrinks gradually, and is finally absorbed into the body to form a part of the small intestine. The eggs of lower mammals are rich in yolk, and their yolk sac is quite developed; the eggs of viviparous mammals are oligoyolk, and their yolk sac is small and does not contain yolk. In normal pregnancy, the size of yolk sac increases with the increase of gestational age from 5 to 11 weeks, and shrinks and disappears after 12 weeks.