Stage of development of the embryo from the moment of fertilization

Despite the fact that in some scale fruit preformed in the germ cells, from which it was formed, its existence as an individual begins to re-appear after conception. Age of gestation in the human embryo, received in the laboratory for the study, almost never defined, except for the most brutal evidence. Even in the case where the embryo is accompanied by the most precise clinical indications, messages are usually built only on the efforts of the patient to recall the circumstances of his sex life in recent times. If we assume that the information about the date of the previous menstrual recorded in a diary, but it is unknown that span the menstrual period, when the woman came out of an egg from the ovary. If for the sake of comprehensiveness of argument we assume that the time of ovulation and intercourse that one, which was prosperous, defined, and then we are able to determine the period of fertilization, up from twelve to 24 hours. If the fetus with an unusually detailed report about the history of origin is taken as a result of spontaneous abortion, but uncertain time of its destruction. We will not have to idea how much time before the birth of its formation and snapped destruction began. Judging by the body of the embryo stage suction, which rarely seen in aborted fetal membranes, it is clear that the interval between the death of the fetus and abortion can be impressive. Specified intervals change too, in order to be able to make enough correct opinion of their duration in each individual case. In the best condition of the fetus extracted during surgery. When naturally developing embryo obtained by surgical procedure, we know with certainty at least the time of his death.

All of the above highlights the increased seriousness of making possible a specific description of features in any case where the process of fetal development to be stopped surgical abortion, in addition, confirmed the importance of having such a description, along with a neatly savings embryo to study in the laboratory, where the fruit will be measured, and then studied through other means necessary to determine the extent of its formation. Solely in the analysis of all the data, we identified are able to increase the accuracy of our knowledge of the phenomena which occur in the course of developing in the womb of existence.

This tendency to concretionary more than one area shows that the lateral accretion is not so conveniently denoted by the suffix PAGUS as intergrowths more localized. Usually they are called, in accordance with those parts that remained ununited - duplicitas anterior or duplicitas posterior (Fig. 119, 120).Fortunately, most closely connected twin freaks like cephalothoracopagus shown in Fig. 120, are not viable. Sometimes less conjoined twins survive.

Дата добавления: 2015-11-14