All of the following statements about the embryology of Meckel's diverticulum are true except:

C. The incidence of Meckel's diverticulum in the general population is 5%.

DISCUSSION: Meckel's diverticulum is a true diverticulum containing all layers of the intestinal wall, usually arising from the antimesenteric border of the ileum 45–90 cm. proximal to the ileocecal valve. It is a vestige of the omphalomesenteric or vitelline duct, which usually undergoes complete obliteration during the seventh week of gestation. Autopsy studies have estimated the incidence of Meckel's diverticulum to be 1% to 2% with men being more commonly affected than women by a ratio of 2:1. Gastric mucosa is present in 50% of all Meckel's diverticula, but in over 75% of symptomatic individuals.