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Interaction between the fastigial pressor response and the defence reaction.

Experiments were performed on chloralosed cats with recording of blood pressure, heart rate and regional blood flows. Electrical stimulation of the fastigial nucleus produced a pressor response. During stimulation of the hypothalamic defence area, fastigial stimulation decreased the muscle vasodilation and augmented the concomitant vasoconstriction in the skin and intestinal beds. These effects from fastigial stimulation could be accounted for by activation of α-adrenergic mechanisms. However, a fastigial inhibition of hypothalamically induced cholinergic vasodilation was also observed in the innervated, cross-circulated limb in which adrenergic blocking drugs had been administered. This suggests that fastigial stimulation can interfere with the activation of the dilator fibres at some level within the central nervous system as well as in the periphery. Both defence area and fastigial stimulation can also cause an adrenomedullary activation. The defence reaction may include a weak activation of the adrenergic outflow to the, muscles which is not readily apparent, because of the baroceptor activation secondary to the widespread systemic adrenergic activation.