Vol. 11, Special Issue 11 (2022)

Author(s):
Prashanth Kumar KS, Ashok Pawar, Girish MH, Ganganaik S, Suguna Rao, Jagadish Hiremath and Rashmi Santhoshkumar

Abstract:
Study was conducted using heads of eight large white Yorkshire pigs procured from the slaughter house. The heads were dissected to locate the nasopharyngeal tonsil. Gross parameters were recorded and samples were collected for histology and ultra-structural studies separately. Grossly, nasopharyngeal tonsil was appearing as a raised mass located on the roof of the nasopharynx in the caudal part of the pharyngeal septum. Histologically, pharyngeal tonsil was covered by pseudo stratified ciliated columnar epithelium with basal supporting cells and goblet cells. This epithelium was modified irregularly at places into Follicle Associated Epithelium (FAE) lined by simple to stratified cuboidal epithelium. In scanning electron microscope, surface of the tonsil was covered with ciliated cells, microvillus cells and in between these Microvillus cells, Microfold cells (M-cells) were observed. Transmission electron microscopy revealed that the M-cells were found all along the epithelium.