Symmetrical conjoined twins

Symmetric twin monsters can be grouped and named according to the part of the body, in which there was a fusion of

Regulatory functions of hormones during fetal gestation

When a woman is in a position, a couple of the most obvious differences from the period, which occurred in a woman to be pregnant, is to stop the process of regular release of the egg from the ovary and detainment period. This immediately shows that the yellow body should participate in some way in this process, because during the cycle in not expecting a child female hormone (progesterone) removed corpus liteum menstruationis, leads to a temporary postponement of the next group of bubbles produced in the ovaries and the changes month before the lining of the uterus. Nonpregnant individual female initiative of this hormone is reduced by about 14 days after the release of the egg, ie, at a time when the corpus liteum menstruationis tissue begins to show signs of reduction. At this stage of the corresponding phase period uterus stops and hypertrophied mucous layer appears in the subsequent period. A lump in the ovary after the remission of the retarding action gestogena under the influence of hormones, manage and coordinate the activities of the endocrine glands is taken to grow a new series of bags.

When, by insemination, followed by implantation of the embryo occurs, the picture changes dramatically. As we have learned, the young fruit is attached when the shell of the uterus is in the active secretion (before the monthly discharge) position. If engraftment occurs, the menstrual cycle is not able to arise. Instead of experiencing a clear recourse rebuild, the shell of the uterus continues to be formed in the same direction as during the premenstrual phase. Increased activity of its excretory organs and increased vascularization apply new live embryo.

From the initial stage of the mechanism by which this process takes place, we are now acquainted mostly on its results. Perhaps there is a substance in the vial creates embryonic shell, which acts on the corpus luteum. If you happen engraftment fetus, subsequent function endocrine gland formed after ovulation, transforms, and in return in order to experience a reduction of about two weeks after the start of its formation from the ruptured follicle, corpus liteum just keeps growing and secretory initiative. During the first 12-16 weeks of pregnancy the embryo is growing to the size, many times overlapping parameters corpus liteum menstruationis, LNH. Even during the second half of pregnancy, when the corpus liteum show signs of reduction, recourse changes subtly and endocrine gland formed after ovulation if fertilization significantly during normal monitoring hardware is for a period after the birth process.

There is every reason to believe that endocrine gland formed after ovulation if fertilization continues to produce the same kind of material as the endocrine gland functioning in the second half of the cycle in the absence of fertilization.

So, perhaps, that the same is the same substance that is in a female is not in a position to generate new suspends bags produced in the ovaries of a pregnant woman stops ovulation until such time as the pregnancy and not end until the regime of regular output egg from the ovary can not re-start their standby for the second pregnancy. Compelling evidence suggests that during the second half of pregnancy, said product glands is in addition the children's place, filling it ovarian source.

Schwalbe divides them into three simple and convenient groups: upper, middle and lower connection. Top Links include fusion occurring in the head and neck, middle - fusion occurring between the neck and the belly button and the bottom - accretion occurring caudally from the umbilicus. Accretion on any of these levels can be front, back and side of the body. If we take this distribution accretions depending on three levels, from three different angles, and varying degrees of fusion, the main types of twin monsters are easy to remember.

Дата добавления: 2015-11-14