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Normalen razvoj človeškega zarodka in nepravilnosti v njegovem razvoju = Normal development and abnormalities in the development of human embryoPetrovič, Danijel, 1963-Human embryology is the science dealing with the development of the embryo andfetus from fertilization to birth. Development begins with fertilization, the process by which the male gamete, the ... sperm, and the female gamete, the oocyte, unite to give rise to a zygote. The zygote undergoes a series of mitotic divisions, increasing the number of cells; a 16-to-32-cell morula is formed, which is transformed into a blastocyst. The blastocyst has two parts, the inner cell mass or embryo proper, and the outer cell mass or trophoblast (future placenta). Teratology is the science dealing with congenital malformations. Approximately 2 to 3% of all living newborns show at least one recognizable congenital malformation. During a certain critical period during pregnancy, embryos are more susceptible to agents or factors causing abnormal development than at other times. Damage to the embryo during the first 3 weeksof embryogenesis (the early period, before the onset of organogenesis) isunlikely to result in defective development, because it either kills the embryo or is compensated for by the powerful regulatory properties of the early embryo. The period of maximal susceptibility to abnormal development occurs between weeks 3 and 8, when most of the major organs and bodily regionsare first established.Source: Medicinski razgledi : [medicinski pregledni, strokovni in raziskovalni članki]. - ISSN 0025-8121 (Letn. 42, št. 2, 2003, str. 183-201)Type of material - article, component partPublish date - 2003Language - slovenianCOBISS.SI-ID - 16992473
Author
Petrovič, Danijel, 1963-
Topics
Fetal Development |
Blastocyst |
Pregnancy, Ectopic |
Trophoblast |
Gastrula |
Placenta |
Fetal Membranes |
Umbilical Cord |
Amniotic Fluid |
Twins |
Abnormalities |
Etiology |
Blastocista |
Gastrula |
Nosečnost izvenmaternična |
Plodov razvoj |
Trofoblast |
Amnijska tekočina |
Anomalije |
Dvojčka |
Placenta |
Plodove ovojnice |
Popkovnica
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Petrovič, Danijel, 1963- | 11252 |
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