Many pregnant mothers can't tell what a gestational sac is, so what is an yolk sac? What is the difference?

Introduction: Most pregnant mothers will have prenatal examination during pregnancy, and B-ultrasound is one of them. Most pregnant mothers will see a gestational sac when they look at the results of B-ultrasound. But we can't see the germ and the fetal heart. Pregnant mothers should learn some relevant knowledge about this kind of problems in order to clearly understand the baby's growth and development. Therefore, the topic that Bian Xiao wants to share today is that most pregnant mothers can't tell what is a gestational sac and what is an yolk sac. What's their difference?

1. What is a gestational sac? What is yolk sac?

Gestational sac is the original placental tissue, and it is an embryo wrapped by vascular amniotic membrane. However, after the gestational sac appeared, the fetus was not fully formed, but the embryo had a heartbeat. Moreover, the gestational sac is also the product of ectopic pregnancy, and the gestational sac can only be seen in the first trimester. Women who have stopped menstruating for 35 days can see the gestational sac in the uterine cavity. After embryogenesis, yolk sac is obviously divided into gastrula embryo and yolk sac outside embryo, which will contain a lot of yolk. The yolk sac is mainly a membrane sac that surrounds the yolk outside the embryo complex. Once it exceeds 2.5 cm, it is called corpus luteum cyst.

2. What's the difference between gestational sac and yolk sac?

The gestational sac is outside, including the yolk sac, and the hormones of embryonic eggs are mostly provided by the yolk sac, not the food of the gestational sac. If there is no pregnancy echo, there is no embryo bud and fetal heartbeat. If you want to see the yolk sac, you must first see the gestational sac. You will see the yolk sac before examining the embryo. With the extension of pregnancy, the yolk sac will gradually disappear. Moreover, the gestational sac and yolk sac are completely different. A gestational sac can be understood as a small embryo. In the early pregnancy, embryo sac can be found by ultrasonic examination. Then the yolk sac will appear. With the yolk sac, the embryo can develop healthily. In a word, yolk sac and gestational sac are two completely different substances, which can only be found by ultrasonic examination, and they appear in different order.