A&P11-Class Notes P30 Lymphoid Organs-Lymph Nodes & Spleen
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| Lymphoid organs include: | 5-L nodes, tonsils, Peyer's patches, spleen & thymus
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| L organs consist of: | diffuse tissue and follicles
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| Lymph Nodes are what shape: | oral or bean; one side concave
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| concave side is called | hilus
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| Lymph nodes are located | along length of the lymphatics
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| L. nodes range in size | from 1 to 25 mm in length (.04 to 1.0 inch)
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| The hilus is the point where: | BV's and Efferent L vessels leave the node
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| Nodes are covered by a fibrous: | CT capsule that has extensions which project into the node.
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| Trabeculae are the | extensions that project into the node
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| Stroma is | the framework of a node
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| Framework of a node (storma) consists of: | 3 hilus, trabeculae and CT capsule
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| Flow of lymph thru node is: | lymph enters the convex side thru Afferent vessels.
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| lymph moves from convex side thru nodes and exits: | at the hilus via the Efferent vessels
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| Afferent/Efferent Vessels-which is less/why | fewer Efferent (exit) vessels; slows lymph
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| slow movement of fluid thru node because | more time for defensive actions
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| L Node has 2 regions: | cortex & medulla
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| Cortex is what layer? | outer
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| Medulla is what layer? | inside
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| Outer layer of densely packed follicles is which layer? | cortex
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| Which layer has germinal centers: | cortex has germinal centers
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| Germinal centers are loaded w/ | proliferating B-cells, which divide by mitosis to form plasma cells
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| Dendratic cells encapsulate the | folicles of the cortex
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| inner cortical layer is primarily: | t-cells
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| The inner layer of L. nodes is called: | Medulla or medullary
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| Medulla shape is defined by: | medullary cords extending from cortex.
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| medularry is composed of | lymphocytes and plasma cells
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| The splees is often described as: | blood rich
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| largest lymphoid organ is: | spleen-size of fist (5" or 12 cm)
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| Spleen is on what side? | Left
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| splenic refers to | spleen
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| what is a site for lymphocyte proliferation | spleen is l proliferation site
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| located in L abdominal: | cavity below diaphragm
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| Spleen has a hilas on | concave surface
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| Hilas is the entry/exit for: | splenic artery/vein
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| Lymphocytes monitor spleen why? | part of defense
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| Spleen extracts aged: | RBC's & platelets from blood
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| What removes debris, toxins, bacteria,ect...from blood: | spleen
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| The spleen is the site of what in fetus: | RBC production
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| Where in the body are blood platelets stored: | spleen stores platelets
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| Spleen also stores breakdown prodcuts of: | RBC's, such as iron
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| Structure of spleen-surrounded by: | fibrous capsule (wraps outer surface)
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| Trabeculae extend: (in spleen) | inward
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| What structure contains lymphocytes and macrophages | spleen has lymphocyles & macrophages
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| White Pulp areas of spleen are: | really aggregations of lymphocytes
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| Lymphocytes in spleen are suspended on: | reticular fibers that surround a central artery
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| In spleen all splenic tissue that is not white pulp is: | red pulp
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| Red Pulp includes: | venous sinusoids (blood sinusoids) and the splenic cords
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| splenic cords are AKAe | cords of Billroth
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| Splenic cords are the supporting: | FRAMEWORK of reticular CT known as cords of Billroth
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