ABSTRACT
A1 C The intracoelomic yolk sac forms the gut. The fetal midgut is attached to the yolk sac via the omphalomesenteric duct (also known as vitelline duct or yolk stalk). This regresses at 5-7 weeks’ gestation. Meckel’s diverticulum results from failure of proximal duct to obliterate. The right and left vitelline arteries originate from the aorta within the yolk stalk. The left involutes and the right persists as the superior mesenteric artery and terminally supplies the diverticulum. Meckel’s diverticulum is a true diverticulum (containing all normal layers of the intestinal wall) located on the antimesenteric border of the small bowel.
