Answer to Question #205963 in Zoology for Anchal verma

Question

Short note on lymphoid organ

Answer 1

The lymphoid organs of the lymphatic system are commonly divided into primary lymphoid organs and secondary lymphoid organs.

The primary lymphoid organs, also called central lymphoid organs, are the organs wherein immature lymphocytes develop. They are where proliferation and maturation of stem cells into immunocompetent cells occur. Examples of primary lymphoid organs include the thymus, the bone marrow, the fetal liver, and the avian bursa of Fabricius.

The secondary lymphoid organs, also called peripheral lymphoid organs, are those wherein cells of reticuloendothelial system carry out their functions. They are associated with the initiation of adaptive immune response. Examples of secondary lymphoid organs are spleen, lymph nodes, tonsils, appendix, and Peyer’s patches.