What Is the Duodenum?
Reviewed: Dr. Gromatzky
5. Duodenal Wall Structure
The duodenal wall consists of four layers: the mucosa, submucosa, muscularis propria, and serosa. The mucosa is further divided into two layers, known as lamina propria and muscularis mucosa, and is lined with columnar epithelium.
The submucosa and muscularis propria are the inner circular and outer longitudinal layers, while the serosa is located on the superficial surface. Brunners glands, which secrete bicarbonate for the protection of the duodenum, are located within the duodenal mucosa.
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