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- W2071163011 abstract "This investigation was performed to demonstrate the morphologic basis of the elevation of fetal proteins in the amniotic fluid of fetuses with neural tube defects. Pregnant rats were treated with hypervitaminosis. A to induce exencephaly or with trypan blue to produce spina bifida aperta. The malformations were studied on days 15-20. On day 15 of gestation, edema developed in the primitive nervous tissue. This was followed by the appearance of quickly expanding hemorrhages throughout the ventricular and intermediate zones. Some capillaries did not rupture but collapsed and showed degenerative changes of the endothelium, probably due to lack of blood perfusion. The ventricular layer in exencephaly and spina bifida aperta was exposed to the amniotic cavity due to non closure of the neural tube. On day 17, this superficial lining of the primitive nervous tissue was disrupted by the expanding hemorrhages and subsequent necrosis. As a result vast amounts of fetal blood and cell debris were extruded into the amniotic fluid. During days 18 to 20, the degeneration of the nervous tissue proceeded rapidly. This process showed the same features in the ventricular cells, the primitive neurons and the neurons. Initially it was characterized by condensation of the nuclear chromatin and the cytoplasm, irregular outlines and breakdown of the plasma membrane. Only part of the cell debris was phagocytozed by macrophages. It is concluded that the leakage of fetal serum and cell debris causes the elevation of fetal protein levels in the amniotic fluid of fetuses with open neural tube defects." @default.
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- W2071163011 date "1979-04-01" @default.
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- W2071163011 title "Light microscopic and ultrastructural observations in advanced stages of induced exencephaly and spinal bifida" @default.
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- W2071163011 doi "https://doi.org/10.1002/tera.1420190209" @default.
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