Abstract
We have analyzed the ultrastructure of normal and immunized jugular bodies in adult frogs to point out new information on these primitive lymphoid organs. They consist of cell cords arranged in a sinusoidal network. The cell cords are formed by a stroma of reticular cells with intercellular spaces filled by free cells. The free cells consist of small and medium lymphocytes, lymphoblasts and developing and mature plasma cells, and in lesser amounts of free macrophages and granulocytes. After immunizing Rana bermeja with SRBC there is an increase in plasma cells at 7 days correlating with the increase in PFC response and in serum antibody titers. However, at 14 days we have observed a diminution in PFC response in the jugular body. At this time, there occurs an increase in the number of eosinophils accompanied by degranulation. The results are discussed from a functional and phylogenetic view.
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