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 ...
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