There is talk of the implantation of eggs when they have been fertilized and have lodged in the uterine lining. Fertilization occurs when the woman has intercourse on fertile days.
On these days, an ovum migrates through the fallopian tube to the uterus and can be fertilized on its way there. If this does not happen, the ovum dies in the uterus. However, if she is fertilized, she will still start to share the first few times in the fallopian tube. In this way, new life is born.
However, the fertilized egg (zygote) can not survive alone in the uterus. Very soon she will need new nutrients. Because of this, the lining of the uterus swells for a while before ovulation to provide the ovum with a living environment when fertilized.
The zygote can then "bury" itself in the mucous membrane and initially continues to divide, while at the same time the umbilical cord forms as a supply to the egg during further pregnancy. Over time, the uterine lining becomes the placenta and the ovum becomes the embryo.
An ovum is fertilized on the way to the uterus, but the pregnancy only happens with their implantation. One of the most common problems with getting pregnant is that an already fertilized egg can not implant itself as it should. Because of this, affected women do not eventually become pregnant, even if they are fertile.
Through the implantation of the egg cell, it can be further supplied with nutrients. Each egg cell has just enough energy to make the first divisions on the way to the uterus, after it has been fertilized. But when it reaches the uterus, that energy is used up and it needs to be taken care of by the woman's body.
This happens after implantation in the mucous membrane, which then develops into a new, only sporadically needed organ: the placenta. Finally, the expectant baby can continue to be cared for - until it is born and feeds itself.
The implantation of the egg is thus a decisive step for the pregnancy and for the reproduction of the human. At the same time, implantation is the first step in the process, which is examined more closely when a woman has difficulty getting pregnant.
The implantation of the egg cell sounds like a simple physical process, but it is not uncommon for women to have problems with it. It often happens that, because of prolonged ingestion of the pill, the mucous membrane of the uterus, despite ovulation, does not become thick enough to permit implantation.
Also problematic are diseases such as endometriosis, which are among the common causes of unwanted childlessness. The mucous membrane of the uterus spreads to other internal organs, but at the same time it is not suitable for allowing the egg to implant.
Even with this disease, although it may come to the fertilization of the egg, but the crucial implantation is missing and the woman is not pregnant. In many cases, such causes are easily treatable, so that childlessness does not have to be a permanent condition.
More difficult are physical problems that prevent the fertilized egg from penetrating the uterus. Deformation, injury or surgical damage to the fallopian tubes can prevent fertilized eggs from migrating through them to the uterus as expected. These can be innate or acquired. In such cases, surgery can help correct the blockages. An artificial insemination is also possible, in which the egg cell is brought from the outside to the right place.
Problems with egg implantation can also be hormonal. These are hormones that are not in the right proportions to create a sufficiently thick uterine lining. In such cases, a targeted hormone therapy can be used in the long term to remedy the situation. Although the success of the treatment does not show up immediately with the implantation of an egg, in the long term the hormonal treatment increases the chances of becoming pregnant.
A rare, but sometimes life-threatening problem with the implantation of an egg is ectopic pregnancy. In this case, the egg does not migrate into the uterus, but remains in the fallopian tube after fertilization or even develops completely outside.
Normally she would die if she moves away from the female genitalia, but she does so late in an ectopic pregnancy. Then it releases toxins that cause the woman first violent abdominal pain and eventually signs of poisoning. If ectopic pregnancy reaches this point, it is life-threatening and must be treated immediately.