Peptic ulcers, commonly known as stomach ulcers, are actually located in the duodenum.
The snarling command of the traffic cop, the blaring insult of horns, all the needlessly raised voices of the night-denizens of Manhattan ravaged his nerves, acidified his duodenum, unhelmed his composure and his will.
William Styron -- Sophie’s Choice
On a handsome mahogany table near him were neatly arranged the quartering knife, the various finely tempered disembowelling appliances (specially supplied by the worldfamous firm of cutlers, Messrs John Round and Sons, Sheffield), a terra cotta saucepan for the reception of the duodenum, colon, blind intestine and appendix etc when successfully extracted and two commodious milkjugs destined to receive the most precious blood of the most precious victim.
James Joyce -- Ulysses
The bile formed by each liver cell gathers in tiny bile tributaries that merge and grow and eventually form the common bile duct that then empties into the duodenum.