TY - CHAP M1 - Book, Section TI - Management of Adenotonsillar Disease A1 - Suurna, Maria V. A1 - Maurrasse, Sarah E. A2 - Lalwani, Anil K. PY - 2020 T2 - Current Diagnosis & Treatment Otolaryngology—Head and Neck Surgery, 4e AB - Both the tonsils and adenoids are part of the Waldeyer ring, a circular structure of lymphoid tissue located in the nasopharynx and the oropharynx. It is formed by the following: the 2 palatine tonsils; the adenoids (or pharyngeal tonsils); the tubal (or Gelach) tonsils, which surround the eustachian tube openings; and the lingual tonsils, lymphoid tissue at the back of the base of tongue. The lymphoid tissue of the Waldeyer ring contains B-cell lymphocytes, T-cell lymphocytes, and a few mature plasma cells. This tissue is primarily involved in secretory immunity and regulates immunoglobulin production. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/03/28 UR - accesssurgery.mhmedical.com/content.aspx?aid=1169075204 ER -