[Structural aspects of the regulatory mechanisms of vascular reactions]

Using antisera against serotonin (5-OT) and neurotensin (NT) with immunofluorescence, 5-OT-immunoreactive and NT-immunoreactive nerve fibers have been detected in the walls of the femoral and pial arteries and intragastric arterioles. With electron microscopy, adrenergic and cholinergic axons were found in close anatomical proximity to some intragastric capillaries and arterioles. A possible role of the detected nerves is being discussed.