[Analysis of the spatial organization of the endothelium of several major vessels].

The aim of the investigation was to appreciate quantitatively the degree of endothelial heteromorphy and its spatial organization according to some indices allowing morphofunctional interpretation of their importance. Endothelium of the rabbit protal and jugular veins was studied in the flat film preparations along the length of 16--20 mm continuously. To elucidate changeability in tissue state, autocorrelative function was calculated with the following determination of spectral density. The latter makes it possible to reveal the presence of a monotonous trend and rhythmicity in vessel structure. Spectral analysis demonstrated that in different parts of endothelium the indices involved varied in their character. The parameters reflecting cell histophysiology are characterized by a marked monotonous trend. The parameters influenced by hemodynamic conditions change rhythmically. Nearly all the indices in the portal vein, evidently because of its peculiar physiological conditions, distinguish themselves by their more complex spectral composition than those of the jugular vein. The quantitative data obtained support heteromorphic character of endothelium and demonstrate that physiology and hemodynamics of the vessel are responsible for its degree of significance as there is a constant interrelation between the vessel and blood.