[The morphogenesis of the tunica elastica interna of the rat aorta in the early periods after birth].

The ultrastructural and three-dimensional spatial arrangement of the internal elastic membrane (IEM) of the rat's aorta was studied by transmissive electron microscopy, native and scanning electron microscopy of chemically extracted specimens. Changes in the passage of different levels of organization of IEM is shown in the process of its maturation in postnatal ontogenesis. The first--fibrillar--step of morphogenesis of IEM is characterized by the formation of microfibril fascicles in 10-day-old animals.

[Cytoskeletal changes in the endothelial cells of the rat aorta in the early periods of postnatal ontogeny].

The cytoskeleton of endothelial cells is a modulator of all the cell reactions. The formation of a definitive structure of the bearing-contracting apparatus of the rat aorta endothelium is finished in the postnatal development (up to the age about 3 months after birth), passing through some qualitative changes. Using the transmission and scanning electron microscopy of detergent extracting preparations, the structuring pattern (saturation) of the aorta endothelial cell cytoskeleton of newborn animals.