student should be able to describe the parts and location of lymphatic system
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Student should be able to Describe the parts and location of
lymphatic system
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Lymph
Lymph vessels
Lymph nodes
Lymph organs
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Lymph is a clear watery fluid, similar in composition to plasma, except plasma proteins.
Carry large particles including bacteria which are destroyed by lymph nodes
Lympha in small intestine – Chyle
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• Lined by endothelial cells
• Present in all parts of the body EXCEPT– Central Nervous System– Bones– Superficial layers of skin
• Join together to form Lymphatic vessels
• Lymphatic vessels join together to form– Thoracic duct Left subclavian vein– Right lymphatic duct Right subclavian vein
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Oval or bean shaped
Functions Filtration Phagocytosis Proliferation of lymphocytes
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Presence of lymph follicles with germinal centers
Covered by capsule
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• Largest lymphatic organ
• Left hypochondriac region
• Functions– Phagocytosis – Abnormal cells– Storage of blood – 350 ml of blood– Immune response – enlarge during infection
(splenomegaly)– Erythropoiesis
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Microscopic structure: Trabeculae
Red pulp – contains blood
White pulp – contains lymphatic tissue
Central arteriole present
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• Lies in the upper part of mediastinum behind sternum
• Grows until puberty then regresses
• Functions– Production of T lymphocytes– Produce “Thymosin” hormone
• Microscopic structure:– Presence of Hassal’s corpuscle
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TONSIL Located in oralcavity Tonsillar crypt present
PEYER’S PATCHES Located in small intestine
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Ross & wilson anatomy & physiology 10th edition – Pgs 132 - 137