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Pharyngeal Tonsil
The pharyngeal tonsils (adenoids) are similar to the other two tonsillar types in that they are composed of aggregates of lymphoid nodules (A). However, they differ significantly in several ways: no crypts are present, the epithelium of the overlying mucosa may be a mixture of nonkeratinized stratified squamous and pseudostratified ciliated columnar (respiratory) epithelium, the mucosa commonly lies in transverse ridges (B), and subjacent glands (C) are usually seromucous rather than solely mucous.
Legend
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A - lymphoid nodules |
C - seromucous glands |
