Remnants of the vitelline duct. A. Meckel's, or ileal, diverticulum combined with fibrous cord (vitelline ligament). B. Vitelline cyst attached to the umbilicus and wall of the ileum by vitelline ligaments. C. Vitelline fistula connecting the lumen of the ileum with the umbilicus.
Credit: Sadler T, PhD. Langman's Medical Embryology, Ninth Edition Image Bank. Baltimore: Lippincott Williams & Wilkins, 2003.