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The wall of the esophagus consist of four layers: the innermost layer is the mucosa (top arrow bar in image), just outside of that is the submucosa (lighter layer between arrow bars), the next layer is the muscularis (lower arrow bar), and the outermost layer is called the adventitia. |
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Below or outside of the lamina propria is the muscularis mucosae (mm), a thin layer of smooth muscle. You can see part of the submucosa (sm) in the bottom of the
image. |
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The esophagus is lined with stratified squamous nonkeratinized epithelium. The stomach is lined with simple columnar epithelium. The arrow points to the junction of the stomach and esophagus. Which side is which? |
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