PATHWAY FOR VISCERAL AFFERENT IMPULSES FROM THE FORELIMB OF THE DOG

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Abstract
Injection of 5% lactic acid into the brachial artery of a dog gave rise to afferent impulses which apparently were painful to the animal. This reaction is dependent upon changes in the vessel wall rather than upon secondary changes in somatic tissues. Removal of the stellate and 2nd thoracic ganglia on one side did not alter the response of the animal to injection of lactic acid into the brachial artery of that side. These visceral afferent impulses enter the cord largely by way of the posterior roots of the 7th and 8th cervical and 1st dorsal nerves.

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