The Lymphatic System Functions Parts returns fluids that have leaked out of blood vessels blood vessels provides structural basis of Immune System lymphatic vessels Lymph fluid in those vessels ID: 929874
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Slide1
Honors AnatomyChapter 20
The Lymphatic System
Slide2Functions Parts
returns fluids that have leaked out of blood vessels
blood vessels
provides structural basis of Immune System
lymphatic vessels
Lymph
: fluid in those vesselsLymph Nodes: structures that cleanse the lymph that flows through themSpleenThymus
Lymphatic System
Slide3Slide4Lymphatic Vessels
1-way networklymph flows:LYMPHATIC CAPILLARIES
COLLECTING VESSELS TRUNKS & DUCTS LARGE BLOOD VEINS HEART
Slide5Lymphatic Capillaries
very permeablepick up fluids, proteins, particulate matter from interstitial spaces
edges of adjacent cells overlap on entry point
essentially acts a valve (or swinging door) so fluid flow only goes in
from capillaries lymph flows through progressively larger vessels
Slide6Slide7Lacteals
special set of lymphatic capillaries in small intestinestransport fat from
villi
blood
Slide8Collecting Lymphatic Vessels
travel with superficial veins
deep arteries
same 3 tunics as veins but have:
thinner walls
more internal valves
anastomose more(junctions with other collecting vessels)
Slide9Lymphatic Trunks
union of larger collecting vesselsmajor lymphatic trunks (all paired but #5)
lumbar
bronchomediastinal
subclavian
jugular
intestinal
Slide10Lymphatic Ducts
receive lymph from the lymphatic trunks*right lymphatic duct
right upper limb
right side of head & thorax
*left lymphatic duct *aka
thoracic duct
drains everything elseCisterna chyli: beginning portion, an enlarged sac anterior to L1 – L2
Slide11Slide12Lymph Transport
no pump to transport lymph veins
flow slow, maintained by
contraction of skeletal muscle
pressure changes in thorax
contractions of lymphatic vessels
Slide13Lymphoid Cells
LymphocytesPlasma cells
Macrophages
Dendritic
cells
Reticular cells: form framework of lymph nodes, spleen
Slide14Slide15Lymphoid Tissue
reticular CThouses macrophages, lymphocytes,
dendritic
cells
appears:
diffuse
Follicles: densely packedmay have germinal centers: B cell proliferating
Slide16Slide17Lymph Nodes
clustered along lymphatic vesselsFunction:
filter lymph
involved in activation of immune system
Slide18Sentinel Node
1st node that receives lymph drainage from a body area suspected of being cancerous
gives best indication of metastasis thru
lymphatics
Slide19Slide20Spleen
Functions:site for lymphocyte proliferation
destroys aged or defective RBCs &
bloodborne
pathogens
stores & releases breakdown products of
Hgbstores pltsfetal site of hematopoiesis
Slide21Slide22Splenomegaly
enlargement of the spleen due to accumulation of infectious microorganisms
Causes:
Septicemia
Mononucleosis
Malaria
Leukemia
Slide23Thymus
T lymphocyte maturation & development of immunocompetence
most active during youth
Slide24Slide25MALT
Mucosa-Associated Lymphoid TissueFunction: prevent pathogens from penetrating mucous membranes
includes:
Peyer’s
patches in intestinal wall
Tonsils
lymphoid follicles in appendix, genitourinary tract, respiratory tract
Slide26Slide27