The relationship between the gestational sac and the placenta

After pregnancy, a woman's body will experience many symptoms and many changes. Before becoming pregnant, women should be prepared to accept these changes. Among them, the gestational sac and placenta are two essential organs for women during pregnancy. Although most people know the existence of the gestational sac and placenta, the relationship between them is still not particularly clear.

The relationship between the gestational sac and the placenta

The gestational sac is the primitive placental tissue, a small embryo wrapped by the amniotic membrane and vascular network. The gestational sac is the initial form of pregnancy. At that time, the fetus has not yet formed, and the fetal heartbeat is already there when the embryonic bud appears. The gestational sac is also a product of ectopic pregnancy. The fertilized egg fails to enter the uterus at 7 days due to certain factors such as inflammation and adhesion. Ectopic pregnancy usually causes heavy bleeding, and generally the fetus cannot survive. From this, we can see that the size of the gestational sac is related to the growth of the fetus. So, what is the size of the gestational sac at 40 days of pregnancy? The 40th day of pregnancy is approximately the 6th week of pregnancy, approaching the 7th week. In the 6th week, the fetus grows to 0.85 cm, and the fetal head, brain alveoli, frontal organs, respiratory, digestive, nervous and other organs are differentiated. The B-ultrasound gestational sac is clearly visible, and the fetal bud and fetal heartbeat are seen; in the 7th week, the fetus grows to 1.33 cm, the embryo has a human shape, the body segments have been fully differentiated, the limbs are separated, and each system develops further. B-ultrasound clearly shows the embryo and fetal heartbeat, and the gestational sac occupies about 1/3 of the uterine cavity.

The placenta is an accessory structure that connects the mother and the baby and is the source of the baby's life. It attaches to the uterus and receives nutrients and oxygen for the baby inside. If it becomes abnormal or aged, it will directly affect the baby's growth and development, and even endanger the baby's life.

There are four levels of placental maturity: grade O, grade 1, grade 2, and grade 3. Level 1 indicates that the placenta is basically mature; Level 2 late indicates that the placenta is mature; Level 3 late indicates that the placenta is aged. Due to calcification and cellulose deposition, the placenta's ability to distribute oxygen and nutrients is reduced, and the fetus is in danger at any time.

Everyone's situation is different. Placenta: mid-pregnancy (12-28 weeks) - placenta grade 0; late pregnancy (30-32 weeks) - placenta I; after 36 weeks - placenta grade II (relatively mature). If a grade III placenta is found before 37 weeks and combined with the value of the biparietal diameter and the estimated fetal weight of 2500 grams, placental precocity should be considered and the patient should be alert to the possibility of intrauterine growth retardation. At 38 weeks, the placenta enters grade III, marking placental maturity.