Abstract
In the following article specific hystochemical features of the fetal ovaries’ structure from mothers with the physiological pregnancy are considered. All fetals were divided into subgroups by taking into consideration the term of gestation, as well as main stages of fetal gonads’ formation and laying. Namely: 21-28 weeks, 29-36 weeks, 37-40 weeks. All fetuses had died intranatally, as a result of acute uterine-placental circulation. The course of pregnancy in all cases was psychological, according to appropriate medical documentation. In the aim of reaching the scientific goal the following research methods were used: macroscopic, organometric, histological, histochemichal, morphometric, statistical. The comprehensive study has revealed the following features of the ovaries’ structure, depending on gestational term: weight, length, thickness, width and volume of the ovaries were reaching their minimum levels in case of fetuses with a gestational age of 21-28 weeks, while the maximum one was reached in case of fetuses on 37-42 weeks of gestation. All gonads are represented by cortical and cerebral matter, with the constant ratio despite of different gestational term. According to the growth of pregnancy term the number of germ cells decreases, while the number of apoptotically altered forms oppositely increases. Primarily it is because of the psychological cells’ death during ovarian formation.The follicular component at all stages of gestation is represented by primordial and primary follicles; at the 37-40 weeks though the atretic forms and cystically altered specimens are appearing. Moreover, in accordance with the growth of the pregnancy term, the number of primordial follicles decreases, while oppositely, the number of primary ones increases. The aforementioned changes lead to the decrease in the relative volume of follicular tissue and to the increase of the relative volume of the interstitial component. By the following histochemical methods (Felgen-Rossenbeck reaction, Brache reaction, Schiff-reaction) an increase in the functional activity of the fetal ovaries was revealed, by reaching its maximum point during gestation of the 37-40 weeks. The aforementioned features correspond with gestational terms as well as with stages of the ovarian development of the fetus. That is why they could be used as a control group during leading a research on characteristical features of fetal gonads structure of fetuses from mothers with complicated pregnancies.
Highlights
In the following article specific hystochemical features of the fetal ovaries’ structure from mothers with the physiological pregnancy are considered
In ovaries of fetuses with a gestational term of 37-40 weeks primary follicles are represented by a rounded oocyte, which is surrounded by a cubic follicular epithelium
The indexes of ovaries’ functional activity were assessed by histochemical methods: Felgen-Rossenbeck, Brache and Schiff-reaction. By evaluation of these reaction the same reaction of their change takes place: the minimum indexes are corresponding with fetuses with a gestational term of 21-28 weeks, while the maximum ones are corresponding with 37-40 weeks of in utero development
Summary
All organs are covered with a protein shell, the thickness indexes of which are generally reaching: in case of fetuses with a gestational age of 21-28 weeks – 24,67±0,26х10ˉ3 m , in a gestational term of 29-36 weeks – 26,73±0,32х10ˉ3 m, on the 37-40 weeks of the in utero development – 22,68±0,29х10ˉ3 m. The average values of a general number of the germ cells, as well as apoptotically altered forms in case of fetuses in different gestational terms are presented in a Table 2. The maximum number of germ cells could be noticed in case of fetuses’ gonads with a gestational term of 21-28 weeks, while the minimum indexes are observed in case of fetuses’ ovaries with a gestational age of 37-40 weeks. In ovaries of fetuses with a gestational term of 37-40 weeks primary follicles are represented by a rounded oocyte, which is surrounded by a cubic follicular epithelium. The indexes of follicles’ number in ovaries of fetuses on different gestational terms are provided in the Table 3
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