A histochemical study of vegetative innervation of blood-vessels of serosa.

Research was carried out into the morphological substrate of the dual (sympathetic and parasympathetic) innervation of blood-vessels of the serosa, including the vessels of microcirculatory system. Tests were carried out on total preparations of the pericardium, pleura and peritoneum of dogs and cats. Using histochemical methods to show up adrenergic (Falck-Hillarp's method) and cholinergic (Koelle-Gomori's method) nerve structures the architectonics of both components of vasomotor innervation in various parts of the arterial and venous sytem of the serosa was described a gradient of their saturation with adrenergic and cholinergic innervation structures gradually decrease, the vessels branching out shown and entering the region of the terminal blood supply. Vegetative innervation of the precapillary arterioles and capillaries appears inconsistent and is mainly restricted to single synaptic contacts arising along the route of adrenergic and cholinergic terminals. In vessels of the venus system, including postcapillary venules and small collecting veins, vegetative innervation (adrenergic and cholinergic) invariably appears scanty and frequently can not be detected at all.