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Vagus is the 10 th cranial nerve…which starts from the brain….it carries parasympathetic nerve fibres which have vital effects on our heart…pulse rate and blood pressure. Vagus has its supply in the neck…in chest and also in abdomen. Thus it has a very large area of distribution….its a sensitive nerve as it gets easily stimulated in subtle alterations of vital functions….it is also called the vagabond or the wanderer as it supplies anything and everything in our body . Vagus nerve has its effect on heart…pulse rate and BP…lung function and respiration…gastrointestinal function and the most important being on autonomic nervous system.