摘要: The circular band of lymphoid tissue within the pharynx consisting adenoids, palatine tonsils (Figure 1), and lingual is known as Waldeyer’s ring. are with prominent germinal centers tonsils, in contrast to have a distinct capsule1which separates from lateral pharyngeal walls. tonsil lies bed three muscles that make up tonsillar fossa. Forming anterior pillar palatoglossus muscle posterior palatopharyngeus muscle, while superior constrictor makes Medially, crypts lay exposed oropharynx specialize stratified squamous epithelium.