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

Meckel's diveiculum is a true diveiculum , usually arising from the anti-mesenteric border of the ileum 45-90 cm proximal to the ileo-caecal valve. It is a vestige of the omphalo-mesenteric or vitelline duct, which usually undergoes complete obliteration during the seventh week of gestation. Caused by incomplete obliteration of the vitelline duct Rule of 2s: 2-years-old, 2 ft from ileocecal valve, 2 inch long, 2% of population Usually asymptomatic Painless bleeding due to ulcer caused by heterotopic gastric tissue Obstruction caused by Intussusception, volvulus, hernia