Waldeyer's ring

From Ganfyd

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