Meckel’s diverticulum is a derivative of:
**Core Concept**
Meckel's diverticulum is a congenital anomaly of the small intestine, resulting from the incomplete closure of the vitelline duct. This abnormality is a remnant of the embryonic connection between the yolk sac and the midgut.
**Why the Correct Answer is Right**
During embryonic development, the vitelline duct connects the yolk sac to the midgut. Normally, this duct obliterates before birth, but in some cases, it fails to close completely, leading to the formation of Meckel's diverticulum. This diverticulum is a true diverticulum, containing all layers of the intestinal wall, and is usually located within 60 cm of the ileocecal junction.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not related to Meckel's diverticulum.
* **Option B:** This option refers to a different congenital anomaly, not related to the vitelline duct.
* **Option C:** This option is incorrect as Meckel's diverticulum is not a derivative of the omphalomesenteric duct, although it is related to the omphalomesenteric duct in its embryological origin.
**Clinical Pearl / High-Yield Fact**
Meckel's diverticulum can cause gastrointestinal bleeding, especially in children, due to the presence of ectopic gastric mucosa within the diverticulum.
**Correct Answer: D. Vitelline duct.**