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 thymus and bone marrow are the primary lymphoid tissues. The lymph nodes and the lymphoid follicles in tonsils, skin, spleen, etc. are all secondary lymphoid tissues. Lymph Node. A group of lymphoid tissues is called a lymph node.