Surgery

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

Meckel's diveiculum usually arises from the ileum within 90 cm. of the ileocecal valve.

Meckel's diveiculum results from the failure of the vitelline duct to obliterate.

The incidence of Meckel's diveiculum in the general population is 20%.

Gastric mucosa is the most common ectopic tissue found within a Meckel's diveiculum.