What are tonsils, anyway? Let’s begin with a short anatomy and physiology review of the tonsils, and for the sake of being inclusive, let’s discuss the adenoids as well. Tonsils and adenoids are a part of the immune system and the body’s first line of defense. Our tonsils are the two round lumps found in the back of the throat, and our adenoids are located higher up in the throat behind the nose and roof of the mouth. The role of these glands is to sample bacteria and viruses