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Different developmental rates of selected brain structures in humans

100%
Dambska M., Kuchna I.
Acta Neurobiologiae Experimentalis
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1996
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vol. 56
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issue 1
83-93
EN
Various rates of development are characteristic for particular structures of the human central nervous system (CNS). The differences of the maturing brain steam and telencephalon are evident in routine neuropathological examination. The fetal and postnatal archi- and neocortex also reveals uneven levels of maturation. In order to precisely describe those differences in humans we performed a morphological and morphometric study on the dorsal vagal nucleus of the medulla oblongata, on Ammon's horn and on neocortex from midgestation to the 18th postnatal month. The numerical density of neurones, cell perikarya andnuclear cross-sectional area, and the ratio of nucleus to perikaryon area were measured. The results demonstrate a development-dependent decrease in cell density and progressive differentiation of neurones according to their changing size. They express a process of maturation which differs in rate across the CNS structures examined.
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Hypoxic damage of the cerebellum in 7-day-old rats. Ultrastructural and histochemical study

100%
Dambska M., Gajkowska B.
Acta Neurobiologiae Experimentalis
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2002
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vol. 62
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issue 1
45-49
EN
The damaging influence of hypoxia on the cerebellum in immature rats, which is still discussed, was investigated. Using material obtained in a modified Levine model for combined hypoxic-ischemic damage in 7-day-old rats, we examined changes in cerebellum submitted to hypoxia only. The results demonstrated classic features of hypoxic nervous tissue damage and calcium accumulation in mitochondria and endoplasmic reticulum. This was investigated using electron microscopy combined with the oxalate-pyroantimonate method. We propose that Ca2+ increases in endoplasmic reticulum and mitochondrial Ca2+ pools may be involved in damage-mediated mechanisms. These results support a role of calcium as a mechanism of cerebellar cell loss after this form of injury.
3
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Inflammatory and reparative tissue reaction in developing human central nervous system

81%
Dambska M., Maslinska D., Laure-Kamionowska M., Toborowicz J.
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issue 4
475-480
EN
Morphologic features of inflammatory reactions in the immature central nervous system (CNS) develop in the second half of pregnancy. The cells composing the infiltrations arise early during development but their presence in circulation and final localization in fully mature inflammatory reactions is prolonged in time. The aim of this work was to compare the picture of inflammatory infiltrations in a group of fetal brains following various infections and aseptic injuries. It was found that numerous granulocytes appeared in bacterial infections, but not in aseptic lesions of the brain. The young maturing blood cells and granulocytes demonstrate the subsequent stages in the development of the inflammatory reaction. The changes depend on the character of the injurious factor and the level of maturation of the CNS. The topography of maturing brain lesions due to infections and anoxic/ischemic damage was similar and localized most often in the periventricular white matter.
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