Chicken

Several cells types are found in the medulla. The most obvious ones are the lymphocytes. The other cells inlude reticular

The nodule has a darker staining cortex with densly packed small lymphocytes. The medulla contains cells of various sizes including

The surface of the bursa fold is covered by a pseudostratified columnar epithelium. This micrograph shows three lymphoid nodules with

The cloacal bursa of Fabricius in birds is a lymphoid organ in the cloaca. Mucosal folds (pleicae) project into the