Why appendicitis pains in umbilical area first?
As the nerve of the appendix is introduced by sympathetic nerve fibers through the celiac plexus and small visceral nerve, its introduction into the spinal cord segment is the 10th 11 thoracic segment. Therefore, in the early stage of acute appendicitis, abdominal pain is visceral neuralgia of the appendix itself, followed by referred pain around the umbilicus. At this time, inflammation is only in the mucosal layer of the appendix, so it is manifested as pain at the site dominated by the neurobody surface of the 10,11 thoracic segment, which is located in the upper abdomen and around the umbilicus.