What are the symptoms of placenta growth?

When the fetus is two or three months in the mother's body, the placenta will gradually grow. Generally speaking, pregnant women will not have any autonomous symptoms when the placenta grows. As a pregnant woman, you must pay more attention to pregnancy checkups during pregnancy, and usually pay more attention to nourishment, especially in terms of diet, and have a balanced nutrition, which will help give birth to a healthy baby.

The structure of the placenta

1. The amnion makes up the fetal portion of the placenta and is the innermost layer of the placenta. The amnion is a translucent membrane attached to the surface of the chorionic plate. The amniotic membrane is smooth, has no blood vessels, nerves or lymph, and has a certain degree of elasticity. The normal thickness of human amniotic membrane is 0.05mm. 2. The chorionic villi form the fetal portion of the placenta and account for the majority of the placenta during pregnancy. When the embryo develops to 13 to 21 days, the villi gradually form. Around the third week after fertilization, when intravillous blood vessels form, fetoplacental circulation is established. The villi that are in contact with the basal decidua are called the chorionic villi. The ends of the villi suspended in the intervillous space filled with maternal blood are called free villi, and those that grow into the basal decidua are called fixed villi. The placental septum that grows from the decidual plate incompletely separates the fetal lobe into maternal lobes. Each maternal lobe contains several fetal lobes, and each maternal lobe has its own spiral artery to supply blood. The spiral arteries of the pregnant woman's uterus (also called the uteroplacental arteries) pass through the decidual plate into the maternal lobe. The substance exchange between mother and fetus takes place in the villi of the fetal lobule. The fetal blood goes through the umbilical artery to the villus capillaries, and exchanges substances with the maternal blood in the intervillous space. The two are not directly connected. The villous trophoblast of the full-term placenta is mainly composed of syncytiotrophoblasts, with cytotrophoblasts only scattered around. The inner layer of the trophoblast is the basement membrane, which serves as a placental barrier. 3. The decidua basalis constitutes the maternal part of the placenta and accounts for a very small part of the placenta in full-term pregnancies. The maternal surface of the placenta is divided into about 20 maternal lobes visible to the naked eye.

Placenta function

1. Material exchange function: Gas exchange, namely oxygen exchange and carbon dioxide exchange; nutrient supply, supplying all nutrients needed for fetal development; and eliminating metabolic products in the fetus. 2. Defensive function Although the barrier function of the placenta is extremely limited, it has a certain barrier function against some bacteria, pathogens and drugs. 3. Synthetic functions such as human chorionic gonadotropin, human placental lactogen, estrogen, progesterone, oxytocinase, thermostable alkaline phosphatase, cytokines and growth factors.