Meckel's diveiculum is considered as true diveicula. It arises from:

Meckel's diveiculum:It is the most prevalent congenital anomaly of the GI tract, affecting approximately 2% of the general population.A 3:2 male-to-female prevalence ratio has been repoed. Meckel's diveicula are designated true diveicula because their walls contain all of the layers found in normal small intestine.Their location varies among individual patients, but they are usually found in the ileum within 100 cm of the ileocecal valve.Approximately 60% of Meckel's diveicula contain heterotopic mucosa, of which over 60% consist of gastric mucosa. Pancreatic acini are the next most common; others include Brunner's glands, pancreatic islets, colonic mucosa, endometriosis, and hepatobiliary tissues. Must know:"Rule of twos" of Meckel's diveicula: 2% prevalence, 2:1 female predominance, location 2 ft proximal to the ileocecal valve in adults, and one half of those who are symptomatic are under 2 years of age. Ref: Tavakkolizadeh A., Whang E.E., Ashley S.W., Zinner M.J. (2010). Chapter 28. Small Intestine. In F.C. Brunicardi, D.K. Andersen, T.R. Billiar, D.L. Dunn, J.G. Hunter, J.B. Matthews, R.E. Pollock (Eds), Schwaz's Principles of Surgery, 9e.