All about fertilization
Fertilization is the name of when sperm can enter the egg, giving birth to an egg or zygote, which will develop and form the embryo that, after its development, will form the fetus, which after birth is considered a baby.
- Fertilization occurs in the fallopian tubes and the egg or zygote begins to divide moving until it reaches the uterus.
- When it reaches the uterus.
- Is implanted in the uterine endometrium and here the nesting officially occurs (nesting site) about 6 to 7 days after fertilization.
Human fertilization occurs when a sperm enters the egg in the first part of the fallopian tube, causing the woman to become pregnant. When a sperm can enter the egg, its wall immediately prevents other sperm from entering.
A single sperm passes through its membrane carrying 23 human chromosomes, which are immediately combined with the other 23 chromosomes of the woman, forming a normal complement of 46 chromosomes, arranged in 23 pairs.
This initiates the process of cell multiplication, the end result of which is the birth of a healthy baby.
In vitro fertilization is when the doctor inserts sperm into the egg, inside a specific laboratory, once the doctor has observed that the zygote develops well, it is implanted in the inner lining of the woman’s uterus, where it can continue to develop until it is ready for birth.This process is also called IVF or artificial insemination.Learn more about artificial insemination here.
The signs and symptoms of fertilization are very subtle and are usually not noticed by the woman, but may be mild colic and a small bleeding or pink discharge, called nesting.In most cases, the woman does not notice the symptoms of pregnancy until two weeks after nest See all the symptoms of fertilization and how to confirm pregnancy.
Embryonic development occurs from nesting to the eighth week of gestation, and at this stage the formation of the placenta, umbilical cord and contour of all organs occurs, from the ninth week of gestation the small being is called an embryo, and after the 12th week of gestation, it is called a fetus and here the placenta has grown enough that , from there, you can provide all the nutrients necessary for the development of the fetus.
The placenta is formed by a maternal component of large, multiple layers, called placental breasts, through which maternal blood continuously circulates; by a fetal component that is mainly represented by a large mass of placental villlosities, which stand out into the placental breasts and through which fetal blood circulates.
Nutrients spread maternal blood through the membrane of placental villus into fetal blood, passing through the umbilical vein to the fetus.
Fetal stools such as carbon dioxide, urea and other substances spread fetal blood to maternal blood and are eliminated by the mother’s excretory functions. The placenta secretes extremely high amounts of estrogen and progesterone, approximately 30 times more estrogen than the body secretes yellow body and approximately 10 times more progesterone.
These hormones are very important for the development of the fetus, during the first few weeks of pregnancy, another hormone also secreted by the placenta, chorionic gonadotropin, which stimulates the yellow body, causing it to continue secreting estrogen and progesterone during the first part of pregnancy..
These yellow body hormones are essential for continued pregnancy during the first 8 to 12 weeks.After this period, the placenta secretes sufficient amounts of estrogen and progesterone to ensure the maintenance of pregnancy.
The baby is ready to be born after 38 weeks of gestation, this is the most common time of a healthy pregnancy, but the baby can be born after 37 weeks of gestation without being considered premature, but the pregnancy can also last up to 42 weeks., which is a normal situation.