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Flashcards in Lymphatic Deck (41):
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Innate immunity

Nonspecific present at birth ask the same against everything I E physical and chemical barriers of skin natural killer cells phagocytes inflammation and fever

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Adaptive immunity

Specific recognition of pathogens as well as specific response to specific pathogen's lymphocytes are responsible for this

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Function of lymphatic system

Assistant circulating bodily fluids help defend the body against diseases specialized form of reticular connective tissue that contains a large number of lymphocytes

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Functions of lymphatic system

Drains exes interstitial fluid transports dietary lipids carries out immune response

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Lymphatic capillaries

Closed at one end and unite to form lymphatic vessels

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Lymphatic vessels

Resemble small veins but Have thinner walls and more valves

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Lymph nodes

Located at intervals along lymphatic vessels contain masses of B cells and T cells

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What lacks lymphatic capillaries

A vascular tissue including cartilage epidermis and cornea of eye. also central nervous system portions of spleen and red bone marrow

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Specs of lymphatic capillaries

Greater permeability of them blood capillaries can absorb large molecules larger in diameter the blood capillaries have one way structure the permits interstitial fluid to flow in but not out

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Anchoring filaments

Attached to lymphatic capillaries there elastic and attach lymphatic endothelial cells to surrounding structures when excess interstitial fluid accumulates the tissue swells these anchoring filaments pool long fat capillaries and make opening between cells larger fluid then moves into lymphatic capillaries

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Lacteals

Special lymphatic capillaries for the small intestine they carry dietary lipids into lymphatic vessels and cause live to look creamy white called Chyle

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Lymphatic trucks

Lumbar intestinal bronchomediastinal jugular and subclavian

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Lumbar lymphatic truck

Adrenal gland Abdominal wall lower limbs viscera of pelvis kidney

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Intestinal emphatic truck

Stomach intestines pancreas spleen liver

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Bronchomediastinal lymphatic trunk

Thoracic wall lungs heart

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Subclavian and jugular lymphatic trucks

Subclavian upper limbs and jugular head and neck

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Lymphatic duct

Thoracic duct and right lymphatic duct. Lymphatic trucks lead to these ducks and these two ducks return lymph back to blood

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Boracic duct

A.k.a. left lymphatic duct about 15 to 18 inches long begins as a dilation known as the cisterna chyli anterior to second lumbar vertebrae main duct for returning lymph to the blood

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Thoracic duct received lymph from

Right and left lumbar trucks left jugular trunk left subclavian trunk left bronchomediastinal trunk. Receives live from left side of head from neck and chest upper limbs entire lower body than ribs. Return slip to the blood at the junction of the left internal jugular and left subclavian veins

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Right lymphatic duct

.5 inches long receives live from right jugular right subclavian right bronco mediastinal trunks upper right side of the body and drains and return slip back to blood at Junction of right internal and right subclavian vein

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Formation and flow

Blood plasma filter through capillaries to form interstitial fluid more fluid moves out and then back in (about 3 L a day of excess filtered fluid) interstitial space this exit fluid drains into lymphatic vessels and becomes lymph

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Important function of the vatic vessels

Return plasma proteins lost into the interstitial space back to the bloodstream

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Formation of lymph pathway

Capillaries interstitial space lymphatic capillaries lymphatic vessels lymphatic ducks junction of internal jugular and subclavian vein

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Lymphatic movement of fluid

Skeletal muscle pump and respiratory pump lymphatic vessels have valves like veins

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Primary lymphatic organs

Stem cells red bone marrow and thymus

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Secondary lymphatic organs

Lymph nodes spleen lymphatic nodules

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Thymus

Belobed organ in mediastinum located between sternum and aorta. Has connective tissue called trabeculae. penetrate inward and divide each lobe into lobules

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T cell production

Large number of T cells enter thymus cortex dendritic cells help with maturation. 2% of T cells survive to mature surviving T cells enter medulla

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Thymus medulla

Mature T cells epithelial cells dendritic cells macrophages. T cells leave dime us via blood and migrate to lymph nodes spleen and other lymphatic tissue

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Lymph node specs

Located along in Fattic vessels there is about 600 in the body they are superficial and deep and usually occurring groups 1 to 25 mm long covered by capsule dense connective tissue

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Flow-through lymph node

Enters effort lymphatic vessel penetrates convex surface of node at several points contains valve that open toward the center of the node live then enter sinuses

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Trabecular sinuses

Extend through cortex parallel to trabeculae

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Madullary sinuses

Extend through medulla and drain into one or two efferent lympatic vessels. wider and fewer in number then afferent vessels. contain valves open away from center of lymph node. come out of hilum along with blood

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Function of lymph nodes

Filter lymph. Foreign substances or truck by reticular fibers within the node. Macrophages destroy some and lymphocytes destroy others. With lots of afferent vessels and only a few efferent vessels travel time is slow

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Spleen

Oval-shaped and is the largest mass of lymphatic tissue in the body it's 12 cm long below the ribs between the stomach and diaphragm

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Spleen impressions

Conforms to the concave surface of the diaphragm there is also gastric impression Renal impression and colic impression

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Hilum

Splenic artery splenic vein and Efferent lymphatic vessels

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White pulp

Lymphatic tissue full of lymphocytes and macrophages they are arranged around the branches of splenic artery (central arteries)

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Red pulp

Blood-filled venous sinuses cords of splenic tissue which consist of RBCs macrophages and lymphocytes and plasma cells and granulocytes veins are closely associated with Red pulp

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Functions of red pulp

Removal of worn out RBCs and platelets. storage of platelets. produce RBCs by hemopoiesis during fetal life

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Lymphatic nodules

Egg shaped masses of lymphatic tissue that are not surrounded by capsule. Scattered in G.I. tract urinary tract reproductive tract and respiratory airways. Sometimes occur in large aggregations what tonsils peyers patches(small intestine) and appendix