PLE-688

A 3-day-old baby is brought to the hospital due to vomiting, fever, and rectal bleeding. Upon physical and CT scan examinations, it is discovered that the baby has a small bowel obstruction and is diagnosed with Meckel’s diverticulum. Which part of the gastrointestinal tract is most likely responsible for the development of the diverticulum, which may be connected to the inner surface of the umbilicus by a fibrous cord?