Lymphoid organs are the organs where lymphocyte origin, maturation, and proliferation occurs. There are two types of lymphoid organs they are primary lymphoid organs and secondary lymphoid organs
1. Primary lymphoid organs
The origin of lymphocytes occurs inside primary lymphoid organs. Those involve the thymus and the bone marrow.
2. Secondary lymphoid organs Upon maturation, the lymphocytes move to a secondary lymphoid organ such as the spleen, lymph nodes, tonsils, small intestine and appendix patches of the payer. They include the sites for antigens to interact with lymphocytes.