part of part of chordate pharynx tonsillar ring UBERON:0001735 oropharyngeal lymphoid tissue Waldeyer's tonsillar ring pharyngeal lymphatic ring the circular lymphoid tissue formed by the lingual, pharyngeal, and facial tonsils uberon FMA:55070 MA:0000752 Waldeyer's ring anulus lymphoideus pharyngis pharyngeal lymphoid ring UMLS:C0459892 gut-associated lymphoid tissue endoderm-derived structure