Histological studies on the tonsil of soft palate in goats

Abstract

Histological studies were conducted on the tonsil of soft palate in six month-old male crossbred goats. The tonsil was located on the nasopharyngeal side of the soft palate. The tonsillar surface epithelium presented small folds and was lined by pseudostratified ciliated columnar epithelium in the rostral half and stratified squamous epithelium in the caudal part. The epithelium mounting over the lymphoid accumulation or follicle associated epithelium was modified into a lympho-epithelium and was disrupted and heavily infiltrated by lymphocytes. Distinct crypts were not seen. In the lamina propria, lymphoid tissue constituted only a small portion of the tonsil and only two to three nodules were seen per low power microscopic field. Most of the lymphoid nodules had germinal centers. The average diameter of the nodules was 131.97±8.03 µm. Loose irregular connective tissue, lymphoid tissue and glands comprised the propria submucosa. The tonsil of soft palate was not encapsulated.

Morphology of the soft palate and palatine tonsil of the goat (Capra hyricus)

“…The tonsil of the soft palate was located in the lamina propria toward the nasopharyngeal surface. Similar findings have been reported in goat, sheep, and ox (Casteleyn et al, 2011; Cocquyt et al, 2005; Indu & Lucy, 2016). In contrast, the tonsil of soft palate in pig and horse are located on oral surface of the soft palate (Casteleyn et al, 2011).…”

“…the nasopharyngeal surface. Similar findings have been reported in goat, sheep, and ox(Casteleyn et al, 2011;Cocquyt et al, 2005;Indu & Lucy, 2016). In contrast, the tonsil of soft palate in pig andF I G U R E 2Morphology of the goat's palatine tonsil showing: (a) The soft palate is transected and reflected lateral showing the palatine tonsil (arrowhead) protruded from a fossa on the lateral wall of the oropharynx, root of tongue (LR), and epiglottis (E).…”