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The Power of the Vagus Nerve. The vagus nerve is part of the parasympathetic nervous system, often called the “rest and digest” system because it helps the body relax after periods of stress ...
However, some common factors that we know to be involved are: 1. Diabetes: High blood sugar levels over time can damage the vagus nerve and 'pacemaker' cells in the stomach muscles. This damage ...
The vagus nerve is also responsible for regulating inflammation in the body, via the inflammatory reflex. [7] Efferent vagus nerve fibers innervating the pharynx and back of the throat are responsible for the gag reflex. In addition, 5-HT 3 receptor-mediated afferent vagus stimulation in the gut due to gastroenteritis is a cause of vomiting. [8]
Many or most cases are idiopathic. The most common known cause is autonomic neuropathy of the vagus nerve, which innervates the stomach. Uncontrolled diabetes mellitus is a frequent cause of this nerve damage, but trauma to the vagus nerve is also possible. Some cases may be considered post-infectious.
the sensory limb is mediated predominantly by CN IX (glossopharyngeal nerve) the motor limb by CN X (vagus nerve). The gag reflex involves a brisk and brief elevation of the soft palate and bilateral contraction of pharyngeal muscles evoked by touching the posterior pharyngeal wall. Touching the soft palate can lead to a similar reflex response.
The vagus nerve delivers two fiber types to the esophageal plexus: . Parasympathetic preganglionic fibers - These fibers have their cell bodies located in the dorsal motor nucleus of the vagus and they will synapse on the terminal ganglia in the walls of the esophagus.
Major effects of damage to the vagus nerve may include a rise in blood pressure and heart rate. Isolated dysfunction of only the vagus nerve is rare, but – if the lesion is located above the point at which the vagus first branches off – can be indicated by a hoarse voice, due to dysfunction of one of its branches, the recurrent laryngeal nerve.
Vagal tone is activity of the vagus nerve (the 10th cranial nerve) and a fundamental component of the parasympathetic branch of the autonomic nervous system. This branch of the nervous system is not under conscious control and is largely responsible for the regulation of several body compartments at rest.