The tenth cranial nerve. It is called “Vagus” (aberrant in Latin) due to its very long path in the body.
The Vagus nerve has many branches and it innervates many organs of the body, among others the Urinary tract, the Digestive system and the heart.
It effects the heart by slowing the heart rate.
The term “Vaso-Vagal episode” relates to over- activity of the Vagus.
Such activity can cause slowing down of the heart rate and decrease of blood pressure and as a consequence fainting. Such episodes can happen as a reaction to pain, mental stress, anxiety or stimulation of other organs that are innervated by the Vagus nerve, for example during urination or bowel movement.