[Electron autoradiographic study of the distribution of 3H-adrenaline in the central nervous system]

3H-Adrenaline was injected into the rat lateral brain ventricle. Half an hour after injection the brain tissue was fixed and the distribution pattern of labeled adrenaline was studied by electron microscopic autoradiography. Silver granules were located mainly above the neuropile. The label content was infrequently different in adjacent synapses. Reasons for dissimilar labeling of adjacent synapses and possibility of using labeled exogenous mediators for studying function of the central nervous system are discussed.