IMMUNOLOGY

Detailed explanation-1: -Secondary lymphoid organs: These organs include the lymph nodes, the spleen, the tonsils and certain tissue in various mucous membrane layers in the body (for instance in the bowel). It is in these organs where the cells of the immune system do their actual job of fighting off germs and foreign substances.

Detailed explanation-2: -This system includes the bone marrow, spleen, thymus, lymph nodes, and lymphatic vessels (a network of thin tubes that carry lymph and white blood cells). Lymphatic vessels branch, like blood vessels, into all the tissues of the body. Also called lymph system.

Detailed explanation-3: -The spleen is part of the lymphatic system, which is an extensive drainage network. The lymphatic (lim-FAT-ik) system works to keep body fluid levels in balance and to defend the body against infections.

Detailed explanation-4: -The lymph nodes monitor the lymph flowing into them and produce cells and antibodies which protect our body from infection and disease. The spleen and thymus are lymphatic organs that monitor the blood and detect and respond to pathogens and malignant cells.

Detailed explanation-5: -Surprisingly, we found that (1) the pituitary (adenohypophysis) is involved and is rich in lymphatic vessels and (2) perinasal tissue could communicate with central pituitary lymphatic vessels in a specific and unidirectional manner.