[kappa5070]

I thought the Vagus nerve is parasympathetic only to the thorax and abdomen. Wouldnt sympathetic stimulation come from nerves coming off the sympathetic trunk running down the lateral aspect of the spine? If something "shocked" the vagus nerve and temporarily interrupted its ability to provide parasympathetic stimulation, the heart would beat harder and faster because it would be under the influence of the SA node only. If the heart needs to beat harder under most conditions, the cardiac plexus provides the sympathetic innervation and sends nore-epinepherine to speed things up. That is my understanding, but I may need to brush up on my cardiac physiology.