Meckel’s diveiculum is a remnant of ?
**Core Concept**
Meckel's diverticulum is a congenital anomaly resulting from the incomplete closure of the vitelline duct during embryonic development. This duct is a communication between the yolk sac and the midgut of the embryo. Failure of this duct to close leads to the formation of a diverticulum.
**Why the Correct Answer is Right**
Meckel's diverticulum is a true diverticulum, meaning it contains all layers of the intestinal wall. It is a remnant of the vitelline duct, which connects the yolk sac to the midgut during embryonic development. The vitelline duct typically closes by the 6th week of gestation, but in some cases, it remains patent, leading to the formation of a Meckel's diverticulum. This diverticulum can cause symptoms due to intestinal obstruction, bleeding, or inflammation.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the origin of Meckel's diverticulum. While the appendix is a vestigial structure, it is not directly related to the formation of Meckel's diverticulum.
**Option B:** This option is incorrect because it does not specify the correct embryological structure. The omphalomesenteric duct is an alternative name for the vitelline duct, but it is not the most commonly used term.
**Option C:** This option is incorrect because it does not accurately describe the embryological origin of Meckel's diverticulum. The allantois is a separate embryological structure that gives rise to the urinary bladder.
**Clinical Pearl / High-Yield Fact**
Meckel's diverticulum is a common cause of gastrointestinal bleeding in children, particularly those under the age of 2. It can also cause intestinal obstruction, diverticulitis, or perforation.
**Correct Answer: D. Vitelline duct.**