Waldeyer's ring

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Waldeyer's ring is a circle of lymphoid tissue in the pharynx that is thought to function as a barrier to infection in the first few years of life. It consists of

  • the adenoids
  • the tubule tonsil, which is paired and lies around the ostium of the eustachian tube in Rosenmueller's fossa
  • the palatine tonsils
  • the lingual tonsils
  • the tubopharyngeal plicae, lateral bands which run almost vertically at the junction of the lateral posterior walls of the oro- and nasopharynx
  • lymphoepithelial collections in the laryngeal ventricle
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