Age of embryos

Despite the fact that, in a sense, pre-formed fetus in the germ cells, from which he emerged, his life as a non-existent body begins after conception. The time span of existence after conception, the embryo of the human individual, delivered to the laboratory for study, almost rarely known, except for the most rough indications. Even if the embryo is equipped with the most insightful physicians source data, information on usual endeavors are based solely on patient recall factors own sexual activity in the last month. If we understand that the information about the time of a last-month period marked in the diary, but do not know the day of menstrual period, when this patient there was a release of an egg from the ovary. If for the sake of completeness of motivation, we assume that during the release of an egg from the ovary and possibly mating, which proved successful, are known, and then we can set the clock of contamination with certainty from 12 to twenty-four hours. If the embryo with an unusually informative description is obtained upon spontaneous termination of pregnancy, it still remains unclear time of his death. We will not show any evidence for a decision about how much to birth ceased its formation and destruction began. Judging by the degree of resorption of the body of the embryo, which sometimes can be seen in the aborted chorionic vesicles, it is clear that the time between the death of the fetus and abortion sometimes significant. Designated interval is not diversify in order to allow the most accurate judgment of their slowness in every single precedent. The most perfect surviving fruits obtained in medical operations. When properly separated the growing fetus in the surgical procedure, we will without a doubt have the knowledge of at least one hour of his death.

All of the above highlights especially the serious preparation as possible is especially true reports on the development of the embryo in each use case, where the process of fetal development should stop surgical abortion, and explains the weight of the collection of this information on the development of the embryo, along with the fruit carefully left to study in the laboratory, where the embryo will be subject to measurement, and should be investigated with other techniques needed to diagnose the stage of its formation. Only when working through all of the materials we are able to increase the facticity of available knowledge of the events which take place during the growing life in the womb.

Teratology

The word "teratology" literally means the study of malformations. Often the term is applied to the study of any anomalies that occur during development. We've already seen one of the sections of teratology, when considered conjoined twins and embryoma. In addition, the teratology study distortion of the structure of the body, caused by reasons other than the factors contributing to the appearance of ugly twins, and abnormalities of internal organs. For convenience and clarity, it is best to consider the common abnormalities of each organ system in the chapters devoted to the development of the system.

Дата добавления: 2015-11-14