Anatomy
·Abdomen
Duodenum
⭐ PREMIUM
The C-shaped duodenum is mostly retroperitoneal and is the foregut–midgut junction (at the major papilla).
FOUR PARTS
• 1st (superior, "cap"): intraperitoneal; commonest site of duodenal ulcer.
• 2nd (descending): receives the bile + pancreatic ducts at the major duodenal papilla (ampulla of Vater); foregut/midgut junction.
• 3rd (horizontal): crossed anteriorly by the superior mesenteric vesse…
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