Lymphatic Flashcards
Function of Lymphatic System
1)Transports excess fluid back to Blood stream 2)Transport dietary/lipids (lacteals) 3) immune function
Lacteals
Small intestine (part of the GI tract) contains special types of lymphatic capillaries called lacteals. Lacteals pick up not only interstitial fluid; but also dietary lipids and lipid-soluble vitamins
Lymph
Excess interstitial fluid and solutes
Lymph Vessels and order
Carry lymph; Ducts -> Trunks -> Vessels -> Capillaries(smallest)
Lymphatic Capillaries
1) Endothelium 2)Cells overlap form 1-way Flaps
Lymphatic Vessels
Resemble veins 2) some connect to lymph nodes. 3) Afferent lymph being lymph to lymph nodes
Lymph exits lymph node via
Efferent Lymph vessel
Efferent
efferent means conducting outward”
Lymphatic Truck Formed from
Merging lymph vessels
Lymphatic Trunk 5 types
R/L Jugular; R/L subclavian; r/L Bronchomediastinal; R/L Lumbar; intestinal(1)
Lymphatic Ducts
Drain from trunks empty into venous circulation
Right lymphatic Duct
Receives from right site of Head neck; right upper limb; right thorax ; Empties into junction of R subclavian Vein and R internal jugular vein
Thoracic Duct
Largest; Cisternae chyli; Receives lymph from LEFT side and everywhere else but right. Drains into junction of Left subclavian and L internal jugular veins
Lymphatic Cells
1) Macrophages 2) Dendritic cells 3) Lymphocytes
3 types of Lymphocytes
1) T-lymphocytes(most) 2) B- Lymphocytes 3) natural killer cells
Helper T- lymphocytes
Helper T Lymphocytes; oversee immune response; secrete cytokines activating other lymph cells
Cytotoxic T lymphocytes
Activated by T helper cells; Directly kill foreign cells (release chemicals)
B-lymphocytes
1) Activated by helper T 2) Become either plasma cells or Memory B lymphocytes
Plasma cells
B-lymphocytes (anti bodies)
Memory Cells
B-lymphocytes: remember antigens; destroy recurrent antigens efficiently
Natural killer cells
Kill variety of infected cells; 1st line of defense(general response)
Lymphatic nodules
No CT capsule around them; cluster of cells; group to form MALT
Cluster of Cells in Lymphatic
1) Germinal center: center w/B-lymphocytes and macrophages 2)T-lymphocytes are outside
MALT
Mucosaassociated lymphoid tissue (MALT) in GI; respiratory; urinary tract(protective)
Tonsils 3 parts
1)Pharyngeal 2) Palatine 3) Lingual
Tonsil Char
No Ct Capsule ; lymphatic tissue
Peyer Patch
Example of MALT in the small intestines ilium
Thymus
Bilobed; anterior mediastinum; Assist T- Lymphocyte development(Children)
Lymph Nodes Function Location
Filters antigens initiate immune response; located along lymph vessels.(axillar; inguinal and cervical lymphatic sinuses
Parts of the Lymph Node
1) Cortex(T-Lymphocytes) 2) Medulla(macrophages) 3) Cluster
Spleen
Largest Lymphatic Organ; LUQ left the kidney; Surrounded by CT capsule with trabeculae(filter blood)
Germinal Center
In Lymph node B- Lymphocytes
Spleen
White pulp surrender by red pulp
More afferent of efferent
More afferent more going toward Lymph node(like the bay bridge)
White pulp of spleen
bacterial blood
Red pulp of spleen
Venous Blood
