lamina propria

The lamina propria is a constituent of the moist linings known as mucous membranes or mucosa, which line various tubes in the body (such as the respiratory tract, the gastrointestinal tract, and the urogenital tract). The lamina propria (more correctly lamina propria mucosae) is a thin layer of loose connective tissue which lies beneath the epithelium and together with the epithelium constitutes the mucosa. As its Latin name indicates it is a characteristic component of the mucosa, "the mucosa's own special layer". Thus the term mucosa or mucous membrane always refers to the combination of the epithelium plus the lamina propria.
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Lamina /lam·i·na/ pl. la´minae [L.] 1. layer; a thin, flat plate of a larger composite structure. 2. l. of vertebra. basal lamina 1. [more]Lamina propria - Community and Resources

A type of connective tissue found under the thin layer of tissues covering a mucous membrane.