Meckel’s diveiculum is a remnant of
**Core Concept**
Meckel's diverticulum is a congenital anomaly of the small intestine, resulting from the incomplete closure of the vitelline duct during embryonic development. It is a remnant of the yolk sac, which normally obliterates during fetal life.
**Why the Correct Answer is Right**
Meckel's diverticulum is a true diverticulum, containing all layers of the intestinal wall, and is usually located in the ileum, most commonly within 60 cm of the ileocecal junction. The presence of gastric or pancreatic tissue within the diverticulum can lead to symptoms such as gastrointestinal bleeding, obstruction, or intussusception. The vitelline duct is a tube-like structure that connects the yolk sac to the midgut during embryonic development.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Meckel's diverticulum is not a remnant of the appendix.
**Option B:** This option is incorrect because Meckel's diverticulum is not a remnant of the Meckel's cartilage, which is a precursor to the mandible.
**Option C:** This option is incorrect because Meckel's diverticulum is not a remnant of the omphalomesenteric duct, although it is related to the vitelline duct.
**Clinical Pearl / High-Yield Fact**
Meckel's diverticulum can cause gastrointestinal bleeding due to the presence of ectopic gastric mucosa, which secretes acid and leads to ulceration of the surrounding intestinal tissue.
**Correct Answer: A. Omphalomesenteric duct remnant.**