[Serotonin- and nitroxidergic neurons of rat medulla oblongata]

The purpose of the present work was topochemical mapping of serotonin- and nitroxidergic neurons in medulla oblongata of 12 Wistar rats in eight nuclei envolved in so-called "bulbar vasomotor to the center". It was found that a portion of serotoninergic neurons lying in a projection of the investigated nuclei, was equal, on the average, to 12-15%, and those in the nuclei of posterior raphe group increased up to 31-43%. Nitroxidergic neurons were distributed more uniformly, and their portion in different nuclei varied from 19 to 49%. 2-6% of neurons were located between the nuclei, and between the nuclei and conducting pathways; these cells presumably carry out integration functions in hemodynamics regulation.