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The wall of the bursa of Fabricius was made up of three tunics. The outermost is tunica serosa, the middle tunica muscularis and inner tunica mucosa which consisted of lining epithelium and lamina propria filled with lymphoid follicles. The lining epithelium was made up of pseudostratified columnar epithelium and is divided into two types i.e. follicle associated epithelium (FAE) or epithelial tuft and interfollicular epithelium (IFE). Lymphoid follicles consisted of an outer thin cortex made up of densely packed lymphoblast and lymphocytes with few macrophages and inner medulla was made up of lymphocytes and loosely arranged reticulo-epithelial cells.

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