An illustration showing the coronal view of the stomach and duodenum with the formation of duodenal ulcers. Ulcers start from the inflammation and breakdown of the duodenal mucosa. The submucosa is then broken-down and perforated. Erosion of the muscularis and serosa leads to a complete perforation. Anatomy highlighted in this view includes the gastric acid, duodenum, mucosa, submucosa, muscularis, and the serosa.
