Anatomical localization and histological characteristics of the feline tonsils. (a) Median section through a feline head. The insert shows a larger magnification of the region in which the tonsils are located. The lingual (rectangular box), palatine (larger circle), paraepiglottic (smaller circle), and pharyngeal tonsils (oval) are indicated. (b) Histological section through a part of the lingual tonsil that is composed of scattered aggregations of lymphoid cells (arrows). (c) Histological section through the palatine tonsil which contains a central tonsillar fossa (asterisk). (d) and (e) Histological sections through the paraepiglottic tonsil (d) and a part of the pharyngeal tonsil (e), respectively.