[Innervation of the renal artery in rabbits]

An ultrastructural study of the innervation of the renal artery in the rabbit is presented. Fixation in KMnO4 was used for the identification of adrenergic nerve endings. This technique ensures the optimal preservation of small granular vesicles which are characteristic for adrenergic axons. All the axon terminals observed at electron microscopic level contained synaptic vesicles of this type. The bundles of adrenergic nerve fibers were located in the adventitia, especially on the border between the adventitia and media.