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: The duodenum forms from the caudal part of the foregut and the cranial part of the midgut. The junction between these two gut segments lies at the opening of the bile duct, which is in the second part of the duodenum.

Step 2: Because the dividing line falls within the second part, this segment receives a contribution from both the foregut and the midgut. Hence the answer is both foregut and midgut.

Step 3: This dual origin is reflected in the blood supply. The part above the major duodenal papilla is supplied by the coeliac trunk (foregut), while the part below is supplied by the superior mesenteric artery (midgut).

Step 4: So pure foregut, pure midgut, or hindgut are all incorrect for the second part of the duodenum.