Together with lymphoid granules and lateral ridges on the back of the pharynx, they form a lymphatic pharyngeal ring surrounding the entrance to the respiratory and pi.digestive tracts. The pharyngeal tonsil, the pathological growth of which is called adenoids, is attached with its base to the posterior wall of the nasopharynx at the exit of the nasal cavity into the oral cavity. Unlike palatine tonsils, it is not possible to see it without special equipment.
Tonsils are part of the immune system, perform a barrier function, preventing further penetration of pathogenic agents into the body. They form lymphocytes - cells responsible for humoral and cellular immunity.
In newborns and children in the first months of life, the tonsils are underdeveloped and do not function properly. Later, under the influence of pathogenic bacteria, viruses and toxins constantly attacking a small organism, the active development of all structures of the lymphatic pharyngeal ring begins. At the same time, the pharyngeal tonsil is formed more actively than others, due to its location at the very beginning of the respiratory tract, in the zone of the first contact of the body with antigens. The folds of its mucous membrane thicken, lengthen, take the form of rollers, separated by grooves. It reaches full development by 2-3 years.