LYMPHATIC SYSTEMLYMPHATIC SYSTEM

Chapter 20Chapter 20

FUNCTIONSFUNCTIONS Drain tissue fluidDrain tissue fluid

House House phagocytic cells phagocytic cells and lymphocytesand lymphocytes

Absorb digested Absorb digested fats via lactealfats via lacteal

COMPONENTSCOMPONENTS Lymphatic vesselsLymphatic vessels

Lymphatic cells and tissuesLymphatic cells and tissues

Lymphatic organsLymphatic organs

LYMPH VESSELSLYMPH VESSELS

LYMPHATIC VESSELSLYMPHATIC VESSELS

LYMPHATIC VESSELSLYMPHATIC VESSELS Lymph capillariesLymph capillaries

Lymphatic Lymphatic collecting vesselscollecting vessels

Lymphatic trunksLymphatic trunks

Lymphatic ductsLymphatic ducts

LYMPHATIC VESSELSLYMPHATIC VESSELS

Right lymphatic Right lymphatic ductduct– Right subclavianRight subclavian

Thoracic ductThoracic duct– Cisterna chyliCisterna chyli– Left subclavianLeft subclavian

LYMPH CELLS AND LYMPH CELLS AND TISSUETISSUE

LYMPHATIC CELLS AND LYMPHATIC CELLS AND TISSUETISSUE

Lymphatic cellsLymphatic cells– LymphocytesLymphocytes– MacrophagesMacrophages– Reticular CellsReticular Cells– Dendritic cellsDendritic cells

Lymphoid TissueLymphoid Tissue

LYMPH ORGANSLYMPH ORGANS

LYMPH ORGANSLYMPH ORGANS

Lymph nodesLymph nodes– Inguinal regionInguinal region– Axillary regionAxillary region– Cervical regionCervical region

LYMPH ORGANSLYMPH ORGANS Lymph node structureLymph node structure

– CapsuleCapsule– TrabeculaeTrabeculae– CortexCortex– MedullaMedulla– Afferent lymphatic Afferent lymphatic

vesselsvessels– Efferent lymphatic Efferent lymphatic

vesselsvessels

LYMPH NODELYMPH NODE

OTHER LYMPH OTHER LYMPH ORGANSORGANS

SpleenSpleen

TonsilsTonsils

Thymus glandThymus gland

Peyer’s patchesPeyer’s patches

SPLEENSPLEEN

TONSILSTONSILS

THYMUS GLANDTHYMUS GLAND

Aggregates of Lymph Aggregates of Lymph TissueTissue

AppendixAppendix

Peyer’s PatchesPeyer’s Patches

PEYER’S PATCHESPEYER’S PATCHES

Aggregates of Lymph Aggregates of Lymph TissueTissue

AppendixAppendix

Peyer’s PatchesPeyer’s Patches

MALT=mucosa-associated MALT=mucosa-associated lymphatic tissuelymphatic tissue

Control and Rate of Control and Rate of FlowFlow

New lymphNew lymph ValvesValves Muscular pumpMuscular pump Respiratory pumpRespiratory pump Artery pulsationsArtery pulsations PeristalsisPeristalsis

DISORDERS OF THE DISORDERS OF THE LYMPHATIC SYSTEMLYMPHATIC SYSTEM

BuboesBuboes ElephantiasisElephantiasis

– Caused by a parasitic worm known as Caused by a parasitic worm known as Wucheria bancroftiWucheria bancrofti

Hodgkin’s diseaseHodgkin’s disease– Characterized by Reed-Sternberg cellsCharacterized by Reed-Sternberg cells

LymphomaLymphoma– Tumor of lymphoid tissuesTumor of lymphoid tissues

TonsillitisTonsillitis– Inflammation and congestion of tonsils Inflammation and congestion of tonsils

usually due to a bacterial infectionusually due to a bacterial infection