The first week of embryo development is the period of division (division) of the zygote into daughter cells. During the first 3-4 days the zygote is divided and simultaneously moves along the fallopian tube towards the uterine cavity. As a result of the division of the zygote, a multicellular vesicle is formed - a blastula with a cavity inside (from the Greek blastos - a sprout).
The formation of most hypothalamic hormones begins in the prenatal period, so all the hypothalamic nuclei differentiate to 14 weeks of pregnancy. By the 100th day of pregnancy, the portal system of the pituitary gland is being completed, and the hypothalamic-pituitary system completes the morphological development by the 19-21 week of pregnancy.
First, two cells are formed from one cell, then a transverse constriction appears, dividing these two cells into two more - there are four of them, then eight, sixteen, thirty-two, and so on.
The fact of pregnancy or, more accurately, conception is the fusion of a sperm with a mature female egg
Every month the woman's organism lives according to the rhythms, determined by nature, all biological processes must take place in the given regime, preferably without failures and changes.
The puerperal, or postpartum period is the period beginning after the birth of the afterbirth and lasting 8 weeks. During this time, reverse development (involution) of organs and systems, which underwent changes due to pregnancy and childbirth, occurs.
Let's take a closer look at the features of each week of obstetric pregnancy.
In our article about the second week of pregnancy, we will try to answer in detail these and not only these questions.
The mammary gland under pregnancy undergoes many changes and plays a very important role in the normal functioning of the female body. Let's consider the features of changes in the mammary gland during pregnancy.
Diseases of the thyroid gland in pregnant women occupy one of the first places among the pathological processes in the endocrine system.