Abstract
Single stimulation of A-fibers of the tibial nerve in cats decerebrated at the rostral border of the mesencephalon (mesencephalic animals) at various levels of the pons, including the region of the pontobulbar junction, and the most rostral levels of the medulla (pontine animals), or rather more caudally to this region (bulbar animals), evoked a late response in the renal nerve, consisting of excitatory and inhibitory components. In 53% of experiments on pontine animals, 42% of experiments on mesencephalic animals, but only 18% of experiments on bulbar animals the excitatory component of the response was small or even absent. The system generating the inhibitory component of the response was most active and most excitable in the pontine cats. However, features indicating relative potentiation of the inhibitory component of action of impulses in A-afferents on vasoconstrictor neurons in the pontine animals were not sufficiently constant to account for the switch from hypertensive reflexes to impulses from somatic A-afferents into hypotensive, taking place after disconnection of the structures of the pontobulbar junction and rostral levels of the medulla from the mesencephalon.
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