LYMPHATIC SYSTEM Chapter 20 FUNCTIONS n Drain tissue

LYMPHATIC SYSTEM Chapter 20

FUNCTIONS n Drain tissue fluid n House phagocytic cells and lymphocytes n Absorb digested fats via lacteal

COMPONENTS n Lymphatic vessels n Lymphatic cells and tissues n Lymphatic organs

LYMPH VESSELS

LYMPHATIC VESSELS

LYMPHATIC VESSELS n Lymph capillaries n Lymphatic collecting vessels n Lymphatic trunks n Lymphatic ducts

LYMPHATIC VESSELS n Right lymphatic duct – Right subclavian n Thoracic duct – Cisterna chyli – Left subclavian

LYMPH CELLS AND TISSUE

LYMPHATIC CELLS AND TISSUE n Lymphatic cells – – n Lymphocytes Macrophages Reticular Cells Dendritic cells Lymphoid Tissue

LYMPH ORGANS

LYMPH ORGANS n Lymph nodes – – – Inguinal region Axillary region Cervical region

LYMPH ORGANS n Lymph node structure – – – Capsule Trabeculae Cortex Medulla Afferent lymphatic vessels – Efferent lymphatic vessels

LYMPH NODE

OTHER LYMPH ORGANS n Spleen n Tonsils n Thymus gland n Peyer’s patches

SPLEEN

TONSILS

THYMUS GLAND

Aggregates of Lymph Tissue n Appendix n Peyer’s Patches

PEYER’S PATCHES

Aggregates of Lymph Tissue n Appendix n Peyer’s Patches n MALT=mucosa-associated lymphatic tissue

Control and Rate of Flow New lymph n Valves n Muscular pump n Respiratory pump n Artery pulsations n Peristalsis n

DISORDERS OF THE LYMPHATIC SYSTEM n Buboes Elephantiasis n Hodgkin’s disease n Lymphoma n Tonsillitis n – Caused by a parasitic worm known as Wucheria bancrofti – Characterized by Reed-Sternberg cells – Tumor of lymphoid tissues – Inflammation and congestion of tonsils usually due to a bacterial infection