The 'Waldeyer's ring' consists of which lymphoid tissues?
- A Palatine tonsils, adenoids, lingual tonsil, lateral pharyngeal bands, and tubal tonsils ✓
- B Palatine tonsils and adenoids only
- C Palatine tonsils, lingual tonsil, and peyer's patches
- D Adenoids and parapharyngeal lymph nodes
Correct answer: A. Palatine tonsils, adenoids, lingual tonsil, lateral pharyngeal bands, and tubal tonsils
Explanation
Waldeyer's ring is a ring of lymphoid tissue guarding the oropharyngeal isthmus comprising: nasopharyngeal tonsil (adenoids), tubal tonsils (near Eustachian tube orifices), palatine tonsils, lateral pharyngeal bands, and lingual tonsil at the base of tongue. Peyer's patches are intestinal lymphoid aggregates and not part of Waldeyer's ring.
Reference: Dhingra Diseases of Ear, Nose and Throat, 7th ed.
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