[Formation of structuro-functional units of the microcirculatory bed of muscles in the postnatal period of the ontogenesis of the white rat].
By means of biomicroscopy, histological methods and scanning electron microscopy topological relationships between the white rat m. cremaster microvessels and changes of their spatial organization have been studied in the postnatal development beginning from the 3d to the 14th week. In the terminal link of the microcirculatory bed zonal functional complexes of microvessels--myoangions are revealed. They represent rather autonomic and regularly repeating constructions of microvessels, having spatial regularity in respect to muscle fibers. With age the myoangion increases its stretchness from 303 +/- 14 in 3-week-old up to (70 +/- 3) X 10 mcm in 14-week-old animals. Capillary density in the m. cremaster during the development decreases from 354 +/- 12 up to 210 +/- 4 mcm, respectively. Distance between the longitudinal capillaries increases from 16.1 +/- 1.3 up to 31.2 +/- 1.8 mcm. Increase of transversal connections takes place in the capillary network, increasing number of the branching knots; this demonstrates certain complication of the nutritive link of the muscle microcirculatory bed. By the time of sexual maturation (6 weeks) there is a sharp decrease of the inflow and outflow coefficients. Higher meanings of the coefficient (0.70-0.74) are noted before sexual maturation period in comparison to that in mature animals (0.53-0.55).
D000818:Animals; D008297:Male; D008833:Microcirculation / Q000254:growth & development; D008855:Microscopy, Electron, Scanning; D024510:Muscle Development; D009132:Muscles / Q000098:blood supply*; D051381:Rats
Stanovlenie strukturno-funktsional'nykh edinits mikrotsirkuliatornogo rusla myshs v postnatal'nom periode ontogeneza u beloĭ krysy.