As soon as the egg is fertilized by the sperm, the formation of a new life begins there. Along with this new condition, several other temporary organs also begin to form and one of them is the vitelline or vitelline vesicle. The yolk vesicle is crucial for the proper formation of the embryo during the first weeks of pregnancy. But do you know what the yolk vesicle is and what does it do? And what is her role in the baby’s formation and even when it is available? So, let’s find out!
How is it formed?
With the fertilization of the egg and the formation of a new nucleus of cells , the zygote goes towards the uterus. On the way, cell multiplication takes place quickly, dividing more and more. Upon reaching the uterine cavity, the newly formed cell pack divides again, this time into 2 parts.
One of them will be the baby and the other part will be the support that this new life will have during pregnancy. The second part will be fixed in the uterus, will accommodate and create a kind of root to remove from the endometrium all the blood necessary for the baby’s initial vascularization.
Implantation is a delicate phase and can cause mild pain and even bleeding ; however, it is also possible that you do not feel anything abnormal. When implantation takes place, development accelerates. What will be the baby begins to form quickly, giving rise to the neural tube. Meanwhile, the other part becomes a kind of balloon, becoming the vitelline vesicle.
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Video with vitelline vesicle 6 weeks
What does she do?
Like the placenta, the vitelline vesicle supports the embryo with oxygen, nutrients and blood, but with one difference: it is temporary, as it remains only until the placenta manages to reach size and maturation to assume its role in pregnancy. Stimulated by the hormone HCG , it grows much faster and, even before the baby can appear, it starts to work.
The aspect of the vitelline vesicle is quite peculiar and characteristic, as it looks like a gas balloon , but in small size, proportional to the stage of pregnancy. It is possible to see it in ultrasound after 5 weeks, together with the gestational sac. The size of the yolk vesicle is much larger than that of the baby at this stage. Therefore, it is possible not to see the baby, but only the baby on the first exam. As the weeks progress, the baby exceeds the size of the gallbladder, and then it will be apparent on the ultrasound exam.
Until When Is The Vitelline Vesicle Active?
As a rule, the vitelline vesicle remains active until around 10 weeks of pregnancy , just before or after. This is because the placenta must be the right size and with the ideal aspect to assume its 100% function. Soon after the placenta takes over the baby’s nutrition, the gallbladder becomes unusable and will wilt over the days. It is not necessary to worry about the vesicle after the function of the placenta starts, as it will take over quickly without having to stop the vascular support that was constant.
Problems With Vitelline Vesicle
It is possible that some abnormalities are detected on the first ultrasound examination. One of them is the increase in the size of the vitelline vesicle or edematous vesicle vesicle. If she is larger than expected (between 3 and 5 mm at 6 weeks), there may be a problem with the development of the fetus.
However, it is not a rule, just a possibility that the doctor must investigate within a few days with a new image exam. Normally, the gallbladder is larger than the embryo , but it cannot exceed the size limit of 1 to 2 too much, that is, it cannot be more than 2 times larger than the baby in the initial phase. If this happens, it is necessary to investigate what is happening: if there is too much stimulus of hormones or if there is a genetic problem of fetal malformation.
My name is Dr. Alexis Hart I am 38 years old, I am the mother of 3 beautiful children! Different ages, different phases 16 years, 12 years and 7 years. In love with motherhood since always, I found it difficult to make my dreams come true, and also some more after I was already a mother.
Since I imagined myself as a mother, in my thoughts everything seemed to be much easier and simpler than it really was, I expected to get pregnant as soon as I wished, but it wasn’t that simple. The first pregnancy was smooth, but my daughter’s birth was very troubled. Joana was born in 2002 with a weight of 2930kg and 45cm, from a very peaceful cesarean delivery but she had already been born with congenital pneumonia due to a broken bag not treated with antibiotics even before delivery.