A pocket- or sock -like outpouching on the anti-mesenteric side of the distal ileum, called a Meckel diverticulum, is caused by:
A. Excessive traction on the intestine during childbirthThe embryonic gut communicates with the yolk sac by mean of the vitelline duct. Failure of this structure to obliterate by the end of gestation can result in a Meckel diverticulum.