There are several types of twin placentas in the human race. You will be surprised to know that not all twins share a placenta and sometimes two of them will merge to become one. To really understand how all this magic happens, you need to understand the different types of twins, how they are conceived and how they are positioned in their mother’s wombs. Let us take a look at the different types of twins.
Dizygotic twins are those that result from the fertilization of two eggs by two different sperms. They are known in layman’s terms as fraternal twins. These are like two siblings who share 50 % of genes unlike identical twins who have the same DNA. Each fetus will lie in their own membrane and will not share any vessels with the other. They lay in different amnion and each of them has their own sac.
The two fetus do not share the same placenta. Each has their own set of blood vessels and their own amnion. In this case there will be two different placentas released after birth. You will also notice that the two placentas in some cases will merge to form one placenta. Though it is not common enough to be the standard it is not very unusual as well. All the dizygotic twins are di-chorionic. This just means that they have different placentas and different sacs. The sacs can be fused, sharing amniotic fluid or completely separated.
These are the result of one egg being fertilized by one sperm. The fertilized egg will then split in a few days after fertilization to form two individual embryos that share the same chromosomes. Monozygotic twins are commonly referred to as maternal twins or identical twins. These two will share almost 100% the same DNA. The two can lay in the same sac or in different sacs depending on when the egg split into two. You can also have the same outer sac and two different inner sacs which is known as monochorionic/diamnotic.
Should the twins split after 3-4 days after fertilization then the membrane configuration would be dichorionic/diamniotic. This means that the twins would be in different sacs and have different placentas just like fraternal twins. The difference is that the two have 100% the same DNA. Fraternal twins only have 50% similar DNA.
Should the egg split between 3-8 days after fertilization then the membrane configuration would be monochorionic/diamniotic. Here the twins share the same placenta and vessels. This is dangerous because it can lead to complications.
Splitting of the egg after 13 days of fertilization means the twins will be in the same sac and will be conjoined.
Most of the IVF embryos end up being twins. Roughly 35% of them turn out to be twins. Most of the multiple pregnancies are twins.
- The Placenta Pill provides placenta encapsulation, tinctures and prints for Denton, Grapevine, Fort Worth and Dallas area families.
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