[Coronary chemoreceptors in rabbits]

Position and structure of the coronary ++chemoreceptor (CH) have been studied in 40 Chinchilla rabbits by means of neurohistological and histochemical methods. The CH is situated in the adventitia of the left coronary artery. The CH together with chromaffin cells includes blood vessels, small nervous fasciculi and connective tissue. According to luminescent intensity 2 groups of cells are distinguished. Two types of CH cells are revealed morphometrically, they differ in their size. Metachromasia at staining with toluidine++ blue demonstrates presence of serotonin in the CH. A possible role of the CH in pathogenesis of a sudden death is considered.