[The participation of the structures of the ventral sections of the medulla oblongata in realizing vasomotor pressor reflexes].

In acute experiments on cats, under constant perfusion of tibial and small intestine vessels and after bilateral electrolytic lesion of ventral portions of the paragigantocellular nucleus a decrease of initial AP by 30-35%, perfusion pressure in tibial vessels by 30% was observed whereas the changes of AP in the small intestine vessel were insignificant. The occlusion of the common carotid artery or electrical stimulation of afferent fibers of brachial plexus exerted no effect, at that. Bilateral administration of L-glutamate into ventral portions of reticular nucleus increased the perfusion pressure in tibial vessels by 15% and in those of small intestine by 35%. Carotid sinus pressor reflex induced 1.5-fold shifts of systemic AP as compared with control values.