[Ultrastructural analysis of preparations impregnated with silver salts].

The work was devoted to the ultrastructural analysis of the neurohistological preparations. Sections of the tissue from the precardial parts of the pulmonary and caval dog veins were impregnated with silver salts after Campos and embedded in the araldite by a special method. Electronmicroscopi studies showed reduced silver adsorbed by the tissue of the impregnated preparations to exhibit a granular structure (the granules were 30-400 A in size). The largest of them were revealed in the axoplasm of the myelinated and unmyelinated nerve conductors, whereas the smaller ones found in various cellular and fibrous formations of the tissue substrate; silver granules were as a rule absent within the thickness of the myelin sheath. The noted regularities of adsorption and distribution of the silver granules in the impregnated preparations caused a morphologically expressed phenomenon of argentophilia.