THE FIFTH STAGE OF TRANSMISSION IN AUTONOMIC GANGLIA

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Abstract
The effects of prolonged rapid stimulation of the cervical sympathetic on the nictitating membrane and on the iris, and of similar stimulation of the vagus on the heart rate were recorded in cats under dial anesthesia. With all 3 indicators the decline of response during fatigue (4th stage of transmission) was followed by a late persistent increase (5th stage). Postganglionic stimulation did not lead to the appearance of a 5th stage. The 4th and 5th stages were probably ganglionic phenomena, analogous to the 4th and 5th stages of transmission described by Rosenblueth and Luco (1939) for somatic neuromuscular junctions. Even a slight interference with the blood supply of the superior cervical ganglion prevented the appearance of the 5th stage.

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