Brunner's glands are seen in:
An extensive array of compound mucous glands, called Brunner's glands, is located in the submucosa of the first few centimeters of the duodenum, mainly between the pylorus of the stomach and the papilla of Vater These glands secrete large amounts of alkaline (pH 9) mucus.
Jejunum
Upper duodenum
Lower duodenum
Appendix
Gastrointestinal System