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Lamina propria is loose connective tissue in a mucosa. Lamina propria supports the delicate mucosal epithelium, allows the epithelium to move freely with respect to deeper structures, and provides for immune defense. Compared to other loose connective tissue, lamina propria is relatively cellular.
The wall of the esophagus from the lumen outwards consists of mucosa, submucosa (connective tissue), layers of muscle fibers between layers of fibrous tissue, and an outer layer of connective tissue.