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[3H]WB-4101 and p-[3H]aminoclonidine were used for light microscopic autoradiographic localization of alpha 1 and alpha 2 adrenergic receptors, respectively, in the rat brain. The binding of these ligands to slide-mounted tissue sections had all of the characteristics associated with alpha 1 and alpha 2 receptors. It was saturable with appropriate kinetic constants and was blocked only by other alpha-adrenergic drugs with the appropriate potency. Autoradiographic studies revealed a distribution of alpha-adrenergic receptors throughout the nervous system. Certain areas had elevated levels. These included parts of the olfactory bulb and nucleus, parts of the cerebral cortex and dentate gyrus, the more medial portions of the hypothalamus and thalamus, the locus ceruleus and nucleus tractus solitarii, and parts of the spinal cord. In certain areas, the distribution of alpha 1 and alpha 2 receptors was markedly different …