<prompt> Brunners glands are seen in:JejunumUpper duodenumLower duodenumAppendix  <response>: An extensive array of compound mucous glands, called Brunners 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. 