The lymphatic system is a network of tissues, vessels, and organs that transports lymph fluid through the body and helps protect against foreign invaders. It contains lymphatic tissue including diffuse and nodular lymphoid tissue. Lymph fluid is absorbed from tissues and contains similar constituents to blood. The lymphatic system contains primary tissues like bone marrow and thymus that create lymphocytes, and secondary tissues like lymph nodes, spleen, and tonsils. Major lymphoid organs are lymph nodes, spleen, thymus, and tonsils, with common lymph nodes found in the groin, armpits, and neck.

1. LYMPHATIC SYSTEM
HISTOLOGY
GM Lochi

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

5. Lymphoid
Organs
◦ Lymph Node
◦ Hemal Node
◦ Spleen
◦ Thymus
◦ Tonsils

6. Lymph Node
◦ these areas are the inguinal nodes in
the groin, the axillary nodes in the
armpit, and the cervical nodes in the
neck.