LYMPHATIC SYSTEM Chapter 20
FUNCTIONS Drain tissue fluid Drain tissue fluid House phagocytic cells and lymphocytes House phagocytic cells and lymphocytes Absorb digested fats via lacteal Absorb digested fats via lacteal
COMPONENTS Lymphatic vessels Lymphatic vessels Lymphatic cells and tissues Lymphatic cells and tissues Lymphatic organs Lymphatic organs
LYMPH VESSELS
LYMPHATIC VESSELS
Lymph capillaries Lymph capillaries Lymphatic collecting vessels Lymphatic collecting vessels Lymphatic trunks Lymphatic trunks Lymphatic ducts Lymphatic ducts
LYMPHATIC VESSELS Right lymphatic duct Right lymphatic duct –Right subclavian Thoracic duct Thoracic duct –Cisterna chyli –Left subclavian
LYMPH CELLS AND TISSUE
LYMPHATIC CELLS AND TISSUE Lymphatic cells Lymphatic cells –Lymphocytes –Macrophages –Reticular Cells –Dendritic cells Lymphoid Tissue Lymphoid Tissue
LYMPH ORGANS
Lymph nodes Lymph nodes –Inguinal region –Axillary region –Cervical region
LYMPH ORGANS Lymph node structure Lymph node structure –Capsule –Trabeculae –Cortex –Medulla –Afferent lymphatic vessels –Efferent lymphatic vessels
LYMPH NODE
OTHER LYMPH ORGANS Spleen Spleen Tonsils Tonsils Thymus gland Thymus gland Peyer’s patches Peyer’s patches
SPLEEN
TONSILS
THYMUS GLAND
Aggregates of Lymph Tissue Appendix Appendix Peyer’s Patches Peyer’s Patches
PEYER’S PATCHES
Aggregates of Lymph Tissue Appendix Appendix Peyer’s Patches Peyer’s Patches MALT=mucosa-associated lymphatic tissue MALT=mucosa-associated lymphatic tissue
Control and Rate of Flow New lymph New lymph Valves Valves Muscular pump Muscular pump Respiratory pump Respiratory pump Artery pulsations Artery pulsations Peristalsis Peristalsis
DISORDERS OF THE LYMPHATIC SYSTEM Buboes Buboes Elephantiasis Elephantiasis –Caused by a parasitic worm known as Wucheria bancrofti Hodgkin’s disease Hodgkin’s disease –Characterized by Reed-Sternberg cells Lymphoma Lymphoma –Tumor of lymphoid tissues Tonsillitis Tonsillitis –Inflammation and congestion of tonsils usually due to a bacterial infection