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The posterior or root portion of the tongue is devoid of papillae but numerous rounded projections or nodules populate the area and are collectively called lingual tonsils. The lingual tonsils are projections of the epithelium that are produced by nodular infiltrations of lymphocytes below the surface. The tonsils are advantageously situated at points of potential entry for bacteria, viruses, and other foreign substances. The openings on the free surface of each lingual tonsil result from the deep invaginations of the surface epithelium called crypts. SEM X220.  3.5" X 4.5"  **On Page Credit Required**