Aspects of Functional Differentiation of the Sympatho-Adrenergic Control of the Cardiovascular System

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Abstract
Experiments are presented, indicating that a differentiation in the discharge of the sympathetic vasoconstrictor fibers is made possible by the fact that the different medullary neuron pools, controlling the functionally different vascular beds, exhibit different thresholds to excitatory stimuli. Such a mechanism makes it possible that the vascular regions can be quantitatively differently engaged even by primarily undiffer-entiated excitatory and inhibitory influences, but it also allows for mass activations. Regional differences in the extent of convergence of fibers from, e. g. higher autonomic centers appear to contribute to this differentiated functional organization.

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