The tonsils are called clusters of lymphoid tissue located at the border of the airway and digestive tract parts. They form a characteristic structure called the "Waldeyer's ring". It consists of the palatine tonsils, the pharyngeal tonsil (the so-called third tonsil), the lingual tonsil, the tonsils of the trumpet, the lateral cords or bands and the scattered lymph nodules of the posterior pharyngeal wall.