Many of us know Siam twins as the first case of Siamese babies. This event became very famous in its time and we know that since then they have not been one of the first cases or the last. We now know that the same patterns are repeated and there have even been new advances in trying to solve this problem.
Siamese babies are twin brothers who, after birth, remain united somewhere in their body. There is still no conclusive clarification as to why this phenomenon is happening, we only know that they are striking cases and in many cases babies have been able to break up successfully.
Why are there Siamese babies?
It all starts from the beginning to form the embryonic process within the mother’s womb. It is not yet known for sure why it happens, but the data does not point to a genetic defect but to a poor development in cell division. That is, to a mistake during the formation of monozygotic twins.
Zygotes are the cells that turn out to be the union of male and female sex cells, which give rise to an embryo or living being. About the third week of gestation is when there is cell division, where there is a separation to form the twins and hence each embryo is formed independently of each other. But because of a slow pace of this separation they grow together within pregnancy and in many cases reaching organ sharing.
Given the case and getting to be visualized by ultrasound, there are no means or ways to avoid this type of pregnancy. During gestation it is advisable that the mother follow a number of visits and protocols, and even maintain correct physical activity and good nutrition.
How often does it happen?
It is estimated that this is a case that usually occurs every 200,000 births, with Africa being the most affected continent. Most cases end up unsurpassed and only 25% of them survive.
Types of Siamese babies
Siamese are cataloged depending on the attached parts of your body. Medicine classifies them:
symmetrical Siamese: those twins who were born symmetrically united and the outer parts of their body have been joined together. It can also happen that they share the same whole body and be bicefalous, with two heads.
Asymmetrical Siamese – those twins who were born united but asymmetrically, in this case one of them is smaller than the other and can become entirely dependent on the most developed.
Where can they be united?
- By the spine: they can join back to back, throughout your spine and buttocks. They can share organs such as the lower gastrointestinal tract and in some cases the genital and urinary organs.
- Abdomen: They are joined by your abdomen near the navel. In most of these cases they share organs such as the liver, small intestine, and colon.
- Pelvis and trunk – bind through the pelvis on either side, either face to face or side. In other cases they have come to join the pelvic area together the abdomen and chest, but with separate heads.
- Chest: They are attached face to face by chest. In this case they can share the same heart, liver and part of the intestine.
- Head and chest: their heads are attached to the back or side and share a part of the skull. In other cases their faces can come to be born together on the side and with the chest attached. They share the same brain and it is an event that usually does not have very good expectations of survival.