Life time estimate of embryos

Although in a sense pre-embryo is formed in the germ cells, from which it was formed, it did not exist as a vital activity of the organism occurs after conception. The age of the fetus after conception homo sapiens, have arrived in the laboratory for the study, almost rarely known, except for the most approximate data. Even in the case when the fetus is equipped with the most detailed physicians raw data messages typically based only on the patient's efforts to recall the conditions of his sex life in recent times. If you anticipate that the information about the date of the previous sexual cycle recorded in a diary, but it is unknown that span the menstrual cycle, when women had a particular place to be ovulating. If in order to complete studies we assume that during the release of an egg from the ovary and that a single copulation, which was successful, set, and in this case we are able to find a watch of contamination up from twelve to twenty-four hours. If the fetus with this particular lengthy history taken an unexpected termination of pregnancy, however, obscure the time of its destruction. We have no reasons to judge that for the amount of time before the birth interrupted its formation and it was the death. According to the stage of embryo resorption cells, which occasionally can be seen in the extracted chorionic vesicles, it is obvious that the time between the death of the fetus and abortion may be decent. Specified time intervals vary too, in order to be able to spend enough accurate assessment of their slowness in each case. Particularly well-preserved embryos extracted in medical procedures. When the developing fetus is naturally separated by a surgical procedure, we at least know the uniqueness of the time of his death.

All of the above highlights the increased importance of collecting as possible especially true history in any situation where it is necessary to interrupt the pregnancy surgery, and this proves the principle of collecting history, coupled with carefully left a nucleus for research medlaboratorii where the fruit is subjected to measurements, and then studied using other techniques needed to determine stage of its development. Only in the study of all of the materials we are able to increase the validity of our knowledge of the phenomena that occur during the ongoing life of the unborn.

In addition, each of the disorders associated with normal convenient to the course of development. Since we have already seen the formation of twin deformities in connection with the twins and defer consideration of the anomalies of the internal organs, we have to consider here is a violation of the shape and proportions of the body and limbs. We turn first to the look of some of these anomalies, and then turn to the possible causes.

References

1. Biological basis of the formation of human malformations. E.P. Miroedova. Astana 2012.

2. Biology. Textbook. / Under red.V.N. Yarygin. Book 1.2. M..2004.

3. P.K. Kazymbet, E.P. Miroedova. Biology. A manual for medical students. Part II. Astana. 2006, 2007

4. Bochkov N.P. Clinical genetics. M.2006

5. Genetics. Under. Ed. Vladimir Ivanov M. ICC "Akademkniga", 2006, 446 p.

Additional:

1. Biology: Training toolkit for med. University students / VP Ivanov, LA Grebennik, AI Kirilenko. - Kursk: Kursk State Medical Publishing, 2003. – 374 pg.

2. Pekhov A.P. Biology and General Genetics: Textbook. - St. Petersburg, Moscow, Rostov: Lan, 2006. – 640 pg.

3. Stambekov S.Zh. Genetics. Novosibirsk, 2002, 467 p.

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