The submicroscopic localization of H3-noradrenaline in the periventricular region of the anterior hypothalamus of the rat was investigated. It was shown that the largest concentration of the label is detected in the neuroglia of the subependymal layers, where the label is detected above the terminals of the axons with two types of vesicles and along the path of the axons above the microtubules. More rarely the label is encountered above the terminals with one type of synaptic vesicle and above cells of the neurosecretory type, similar in ultrastructure to cells of the arcuate nucleus. In the ependymal layer the label is localized above the cells and intercellular spaces. The results of the work are discussed in connection with the modern data on the fluorescence of the catecholamines of the hypothalamus.
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