The adenoids (lymphatic tissue in the back of the throat), along with the tonsils, comprise the Waldeyer ring.
Review Date 12/31/2020
Updated by: Josef Shargorodsky, MD, MPH, Johns Hopkins University School of Medicine, Baltimore, MD. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.