Vol. 12, Issue 1 (2023)

Author(s):
Madhu D, Ashok Pawar, Girish MH, Ganganaik S, Suguna Rao and Jagadish Hiremath

Abstract:
The present research work is carried to know the distribution and nature of lymphoid tissue in the nasopharyngeal tonsil of adult dogs. The materials of the study was collected in eight adult dogs which were euthanized in renal failure cases across Bangalore city. The heads were dissected to locate the pharyngeal tonsil by cutting the head into two half by band saw machine. One half is fixed in 2% acetic acid solution, the other half is used to study the gross parameters and samples were collected for histology in different fixatives. Grossly, pharyngeal tonsil is appeared as thin sheet of raised mass of organised lymphoid tissue located on the posterior wall of the nasopharynx and distal to the opening of auditory tube. Histologically, pharyngeal tonsil is lined by pseudo stratified ciliated columnar epithelium with basal supporting cells and few goblet cells. The Follicle Associated Epithelium (FAE) which interrupts the continuity of epithelia at places are the migrations of lymphocytes from the follicles into the epithelium which is also known as reticular epithelium which is lined by simple to stratified cuboidal cells with less number of collagen and reticular fibre below the basement membrane.