Question

The 2nd part of the duodenum is derived from?

• A. Foregut
• B. Midgut
• C. Both foregut and midgut
• D. Hindgut

Hint:

The foregut-midgut junction lies at the major duodenal papilla.

Answer 1

The Correct Option is C

Step 1: Developmentally the gut tube is split into foregut, midgut and hindgut by the arteries that supply them, the coeliac trunk, the superior mesenteric artery and the inferior mesenteric artery.

Step 2: The foregut and midgut boundary sits at the level of the major duodenal papilla, where the bile duct enters the second part of the duodenum.

Step 3: Since that boundary passes through the second part, this portion is built from both the foregut and the midgut, giving it a mixed arterial supply from the coeliac trunk above and the superior mesenteric artery below.

Step 4: A single origin, foregut alone or midgut alone, or a hindgut origin, cannot be correct for this transitional segment.

\[\boxed{\text{Both foregut and midgut}}\]