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Updated: September 6, 2025
The functions of the pneumogastric nerves were violently disordered in this disease, as was shown by the oppressed respiration and extreme anxiety, with nausea and vomiting, symptoms to which modern physicians attach much importance. The stupor and profound lethargy show that there was an injury to the brain, to which, in all probability, was added a stagnation of black blood in the torpid veins.
Various stimuli coming through the pneumogastric nerves, either from above or from the peripheral endings in the stomach or intestines, may inhibit or slow the ventricular contractions. It seems to have been again shown, as was earlier understood, that there are inhibitory and accelerator ganglia in the heart itself, each subject to various kinds of stimulation and various kinds of depression.
It is a familiar physiologic fact that stimulation of the vagi slows the heart or even stops it. Stimulation of these nerves by the electric current, however, does not destroy the irritability of the heart; indeed, the heart may act by local stimulation after it has been stopped by pneumogastric stimulation.
It may be caused by the condition of the blood, whether it be impoverished anemia or too rich in red globules; by reflex irritation of the pneumogastric or sympathetic nerves; by overexertion; or by alcoholism. It may also be due to general debility; the woman resists fatigue less easily, and she experiences a general malaise.
"The Jap must have been an expert in jiu jitsu, the wrestling game of that country. I've made a stagger at studying medicine since then, and learned a little. The pneumogastric nerve did the business. It passes from the base of the brain, down past the heart and lungs and ends near the stomach. It is motor, sensory, and sympathetic, all in one.
As this is a dangerous location for a layman to interfere with, owing to the branching of the carotid artery, pneumogastric nerve and jugular vein, it should be done by a qualified veterinarian. Forage Poisoning. Last fall one of our horses was taken ill and had a swollen jaw. He died soon and we supposed that he had been kicked and died of lockjaw. This spring another was taken ill.
Occasionally if shock is decided to be due to a toxemia, the toxin may be diluted by the withdrawal of a small amount of blood and the transfusion of an equal amount of saline solution. This condition is not well understood, nor is its frequence known, but not a few instances of shock are due to dilatation of this organ. The shock to the heart may be a reflex one through the pneumogastric nerves.
During the next minute the respirations are not more than one or two, and the heart has fallen really below, in some cases, the standard beat, showing most conclusively that once oxygenation has taken place and that the free carbonic acid gas has been so completely consumed, that there is no involuntary call through the pneumogastric nerve for a supply of oxygen.
The tenth pair, the pneumogastric, also known as the vagus or wandering nerves, are the longest and most complex of all the cranial nerves. They are both motor and sensory, and are some of the most important nerves in the body. Passing from the medulla they descend near the oesophagus to the stomach, sending off, on their way, branches to the throat, the larynx, the lungs, and the heart.
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