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Regularities in the formation of ultrastructure of elements in the microcirculatory system during early stages of human embryogenesis

, : Regularities in the formation of ultrastructure of elements in the microcirculatory system during early stages of human embryogenesis. Arkhiv Anatomii Gistologii i Embriologii 90(6): 9-13

By means of transmissive electron microscopy methods, general regularities in development of the microcirculatory system have been studied at early stages of the human prenatal ontogenesis in functionally different organs. Ultrastructure of two cell types has been described in the mesenchyme of human embryos. Formation mechanisms of the primary blood vessels belonging to the protocapillary type are revealed. Structural peculiarities of the primary protocapillary network differentiating into various links of the secondary organospecific hemomicrocirculatory bed are distinguished. Certain stageness in development of the microcirculatory system is stated, its blood circulatory compartment including. Two stages are determined in development of the microcirculatory system: prevascular and vascular microcirculation. The latter includes the precirculatory and circulatory phases.


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