This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
Meckel's diveiculum is a remnant of ? 
Select and explain. 
A. Stenson's duct, B. Wolffian duct, C. Mullerian duct, D. Vitellointestinal duct
D: Vitellointestinal duct
Answer: D: Vitellointestinal duct 
Explanation: Ans. is 'd' i.e., Vitellointestinal duct Meckel's diveiculum Meckel's diveiculum is the persistent proximal pa of the vitellointestinal duct which normally disappears during intrauterine life. It follows 'rule of 2' :- present in 2% subjects, 2 inches (5 cm) long and is situated 2 feet (60 cm) proximal to ileocoecal valve. It is attached to antimesenteric border of ileum. Its calibre is equal to that of the ileum. Its apex may be free or attached to umblicus or mesentery by a fibrous band. o Vitellointestinal duct posseses all three coats of intestinal wall.