Tuesday, 4 October 2011
meckel"s diverticulum
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All of the following statements about the embryology of Meckel's diverticulum
are true except:
are true except:A. Meckel's diverticulum usually arises from the ileum within 90 cm. of the ileocecal valve.
B. Meckel's diverticulum results from the failure of the vitelline duct to obliterate.
C. The incidence of Meckel's diverticulum in the general population is 5%.
D. Meckel's diverticulum is a true diverticulum possessing all layers of the intestinal wall.
E. Gastric mucosa is the most common ectopic tissue found within a Meckel's diverticulum.
Answer: C
DISCUSSION: Meckel's diverticulum is a true diverticulum containing all layers of the intestinal wall, usually arising from the antimesenteric border of the ileum 45–90 cm. proximal to the ileocecal valve. It is a vestige of the omphalomesenteric or vitelline duct, which usually undergoes complete obliteration during the seventh week of gestation. Autopsy studies have estimated the incidence of Meckel's diverticulum to be 1% to 2% with men being more commonly affected than women by a ratio of 2:1. Gastric mucosa is present in 50% of all Meckel's diverticula, but in over 75% of symptomatic individuals.
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