AbstractThe adrenergic innervation of the rat oviduct was studied by fluorescence microscopy. The outer half of the circular muscle layer was penetrated by a thin net of adrenergic nerve terminals throughout the isthmus. Adrenergic nerve terminals were scarcely seen in the muscular wall of the ampulla. In the mesotubarium close to the oviduct a dense net of adrenergic nerve terminals were observed. The functional role of the observations is discussed.