Titlebook: Atlas of Human Prenatal Morphogenesis; Jan E. Jirásek Book 1983 Martinus Nijhoff Publishers, Boston 1983 brain.central nervous system.deve

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Material and Methods,medical studies. Since 1960, I have collected, dissected, and incubated with various substrates, more than 500 specimens. Clinical history was recorded for all embryos. Embryonic age was calculated from the last normal menstrual period of the mother. The conceptional age was calculated by adding 14

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External Form of the Embryo and Developmental Stages,ing of this period, the unique genetic system of an individual is established by the union of the male and female germ cells (fertilization). Subsequent development of the fertilized oocyte gives rise to the conceptus: embryo, fetus, newborn, and fetal envelopes. The role of genetic factors and thei

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Organs with Endodermal Components,he formation of the anterior body wall and the umbilical cord, the dorsal portion of the yolk sac transforms into the primitive gut, which is closed anteriorly by the buccopharyngeal membrane and posteriorly by the cloacal membrane. The blind anterior portion of the primitive gut is known as the for

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