Lymphoid tissues and organs, along with the lymphatic vessels constitute a very widespread and extremely important filtering system between the body tissues (where foreign substances and organisms can enter) and the blood stream. Today’s lab will focus on distinct lymphoid organs, like the lymph nodes, the thymus and the spleen as well as more diffuse collections of lymphocytes, which are primarily located along the mucosa of the digestive and respiratory tracts.


Objectives

• Recognize lymphocytes in the various immune organs.
• Distinguish the different lymphatic organs in LM preparations.
• Recognize the different regions of lymph nodes, spleen and thymus.
• Know the major functional significance of the lymph nodes, spleen and thymus
• Understand the filtration mechanism for lymph in the lymph nodes and for blood in the spleen

The actors.