Tonsils

tonsils, name commonly referring to the palatine tonsils, two ovoid masses of lymphoid tissue situated on either side of the throat at the back of the tongue. The pharyngeal tonsils, or adenoids, are masses of similar tissue located in the nasopharynx, and the lingual tonsils are rounded masses of tissue on the back of the tongue. The tonsils act as a filter against disease organisms. However, they often become a site of infection, a condition known as tonsillitis, and sometimes become enlarged. This condition is more prevalent during childhood, since tonsil tissue tends to regress with age. Removal of the tonsils is sometimes advised if frequent inflammation poses a threat to health. See respiration.

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Tonsils 

masses of lymphadenoid tissue in the mucous membrane in the vicinity of the pharynx. Distinction is made between the lingual tonsils (on the dorsal surface of the tongue), the pharyngeal tonsils (in the vault of the pharynx), the tubal tonsils (near the opening of the auditory, or eustachian, tubes), and the palatine tonsils (between the palatoglossal and palatopharyngeal arches). Lymphocytes are produced in the tonsils, and from there they are partially discharged into the lymph stream. The tonsils play an important role in protecting the body against pathogenic microorganisms and in creating immunity.