The fourth hypothesis was commonly accepted, but it was later shown that the right vitelline artery ( right omphalomesenteric artery ) did not supply the anterior abdominal wall in this area.
2.
A "'Meckel's diverticulum "', a true congenital diverticulum, is a slight bulge in the small intestine present at birth and a vestigial remnant of the omphalomesenteric duct ( also called the vitelline duct or yolk stalk ).