Top 102 Master Degrees in Medicine 2017. A student may choose to pursue a masterâs degree after receiving their bachelorâs degree. This postgraduate program typically takes about two to three years to complete.
The spleen and the thymus are also lymphoid organs of the immune system. The tonsils are lymphoid organs that are also associated with the digestive system. Lymphoid tissues contain lymphocytes, and also contain other types of cells for support.
The Organs of the Immune System. 1  Bone Marrow -- All the cells of the immune system are initially derived from the bone marrow. 2  Lymph Nodes -- The lymph nodes function as an immunologic filter for the bodily fluid known as lymph.