| Abstract: | Correlation between morphology and function in the hippocampus and hypothalamus was studied by electrophysiological and morphological techniques. Single unit responses were recorded extracellularly in the arcuate and medial preoptic nuclei of the hypothalamus to application of single stimuli to the hippocampus. Phasic responses and primary inhibition predominated in the arcuate nucleus, whereas both phasic and tonic responses were observed in the medial preoptic nucleus. In the morphological experiments horseradish peroxidase was injected into the same region of the hippocampus. Stained cells were found in the nuclei of the mammillary body, mediobasal hypothalamus, and medial preoptic nucleus. Groups of stained neurons were discovered at the periphery of the ventro- and dorsomedial and also in the lateral and mammillary nuclei of the hypothalamus. Besides fusiform and triangular neurons, reticular neurons also were found in all structures except the medial mammillary nucleus. The results are discussed from the standpoint of interaction between hypothalamus and hippocampus.A. A. Zhdanov State University, Leningrad. Translated from Neirofiziologiya, Vol. 11, No. 5, pp. 427–434, September–October, 1979. |
