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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.
This view is part of the mucosa, which is closest to the lumen. Notice the basophilic epithelium, and the abrupt change to the lighter connective tissue to the left. Click the Mouse-over button to identify these different tissues. Click link 1.