Pharyngeal lymphoid ring
Anulus lymphoideus pharyngis
- Eponym: Waldeyer's ring
Definition
The pharyngeal lymphoid ring, also known as Waldeyer's ring, is a collection of lymphoid tissues located in the pharynx, which serves as a critical component of the mucosa-associated lymphoid tissue (MALT). This ring includes the palatine tonsils, nasopharyngeal tonsil (adenoids), lingual tonsil, tubal tonsils, and lateral pharyngeal bands
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