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  TONSILS   ·         Tonsils are collections of lymphoid tissue facing into the aerodigestive tract. ·         The set of lymphatic tissue known as Waldeyer's tonsillar ring includes the adenoid tonsil , two tubal tonsils , two palatine tonsils , and the lingual tonsil .     Structure Tonsils in humans include: Type Epithelium capsule Crypts Location Adenoids  (also termed "pharyngeal tonsils") Ciliated pseudostratified columnar  ( respiratory epithelium ) Incompletely encapsulated No crypts, but small folds Roof of  pharynx Tubal tonsils Ciliated pseudostratified columnar (respiratory epithelium) Roof of pharynx Palatine tonsils Non-keratinized stratified squamous Incompletely encapsulated Long, branched Sides of  oropharynx  between palatoglossal and palatophar