Histology USMLE Step 1 Practice Question
A 48-year-old man with chronic epigastric pain (BP 128/82, HR 88, RR 16, Temp 37.2°C) undergoes upper endoscopy. Duodenal biopsy reveals normal villous architecture with intact crypts of Lieberkühn. Notably, Brunner's glands in the submucosa secrete alkaline mucus to neutralize gastric acid. H. pylori staining is negative. Which anatomic segment of the small intestine was sampled?
Answer choices
- ADuodenumCorrect answer
- BJejunum
- CEsophagus
- DColon
- EIleum
- FStomach
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