2. Lymphatic system
◦ The lymphatic system is a network of tissues, vessels and organs that work together to move a colorless,
watery fluid called lymph back into your circulatory system (bloodstream). ... Protects your body against foreign
invaders:
◦ Lymphatic tissue: A part of the body's immune system that helps protect it from bacteria and other foreign
entities
◦ Lymphoid Tissue: Reticular CT in which lymphocytes, macrophages plasma cells and stems are found.
◦ Diffused lymphoid tissue
◦ Nodular lymphoid tissue
◦ Lymph: Lymph is fluid which has been absorbed into the lymphatic system from the interstitial spaces. It is a clear
watery substance which contains constituents similar to those in blood
3. Afferent lymph & Efferent lymph
Afferent lymphatic
vessels are only found
in lymph nodes
efferent lymphatic vessel
which are also found in
the thymus and spleen.
4. Types of lymphatic tissue
◦ Primary lymphatic tissue: These organs include the bone marrow and the thymus. They create special immune system cells
called lymphocytes.
◦ Secondary lymphatic tissue: These organs include the lymph nodes, the spleen, the tonsils and certain tissue
