[The participation of mast cells and serotonin-immunoreactive fibers in the innervation of the cerebral vessels]. / Uchastie tuchnykh kletok i serotonin-immunoreaktivnykh volokon v innervatsii sosudov mozga.

Interrelations between adrenergic and serotoninergic nerve fibres and mast cells located near the vascular wall were studied on total preparations of rat brain pia mater. Histochemical method with glyoxylic acid revealed the dense network of adrenergic fibres and their terminal regions with variceal endings with mast cells located next to them. Immunohistochemical methods (fluorescent and method with use of peroxidase antiperoxidase complex) with the aid of antiserum serotonin showed the content of serotonin in these cells. Distribution of serotoninergic nerve fibres resemble that of adrenergic fibres with density being significantly lower. The fibres have frequent contacts with mast cells processes. These data indicate the presence of functional connection between serotonin positive nerve fibres and the possibility of their drawings in control of blood circulation of brain.

[Seasonal changes in the adrenergic fibers in the wall of the microvessels of the cheek pouch of the hamster, Mesocricetus auratus]. / Sezonnye izmeneniia adrenergicheskikh volokon v stenke mikrososudov zashchechnogo meshka u khomiaka Mesocricetus auratus.

Adrenergic innervation has been investigated by fluorescent histochemical method with glyoxylic acid. Adrenergic fibers were found in summer period on the arterioles with a diameter varying from 100 to 30 micron, their fluorescence being significantly lower than that in the vessels of microcirculatory bed of the mesentery, tongue, femoral muscles of the same animal. No adrenergic fibers were revealed on the arterioles with a smaller diameter, on veins and venules. In winter period, fluorescence is completely absent from all the vessels of the cheek pouch, which may be due to the decrease in the level of catecholamines in the nerves and other tissues during hibernation.