[Ultrastructure of the capillary cellular elements of the human brain in prenatal ontogeny].

Peculiarities of ultrastructural organization of cellular elements of the brain capillaries have been studied for human embryos and fetuses during prenatal ontogenesis (10-32 weeks). Redistribution of organoids, alterations of amounts and size of microvilli and vesicles in the cytoplasm of endothelyocytes were observed during intrauterine development. The character and extent of correlations among the endothelyocytes and pericytes were found to alter. The differences revealed in the structural organization of capillaries are presumably related to the changeable hemodynamic conditions of functioning of the brain capillaries during the intrauterine development.