The morphodynamic patterns of the paraventricular nucleus in rats under experimental conditions. I. Cytoarchitectonic studies.

An elaboration of the cytoarchitectonics of the PVN and the topography of the neurosecretory cells scattered in the anterior hypothalamus in rats subjected to various experiments is presented. The most distinct and complete patterns were obtained from rats with experimental occlusion of the small intestine, in the early post-laparotomy period and after withdrawal of food and water for periods of 6, 12, 24 hours. A hitherto undiscovered group of neurosecretory cells was found in the stria terminalis and single cells of that type near the anterior commissura.