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Chapter 20-2008 - The Lymphatic System Introduction The...

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The Lymphatic System Introduction: The Lymphatic System consists of two semi-independent parts: A network of lymphatic vessels Various lymphoid tissues and organs throughout the body I. Lymphatic vessels Pressures in the capillary beds force fluid out of the blood at the arterial ends of the beds. While most is reabsorbed at the venous ends of the beds, some fluid is left in the interstitial spaces The fluid of the interstitial spaces must be carried back to the CV system to maintain blood volume Lymphatic vessels are an elaborate system of drainage vessels that collects the excess protein- containing interstitial fluid and returns it to the bloodstream Lymph : “clear water” : Structure small to large: capillaries, vessels, trunks, ducts Lymph capillaries: Lymph vessels begin as lymph capillaries: very permeable due to: 1. 2. Lacteals : specialized lymph capillaries in the villi of intestines: help to absorb digested fats from intestine. Lymphatic collecting vessels: Similar to veins but thinner walled and have more valves Lymphatic Trunks: Formed by union of the largest collecting vessels Drain large areas of the body Major trunks include; 2 Lumbar trunks 2 Bronchomediastinal trunks 2 Subclavian trunks 2 Jugular trunks 1 Intestinal trunk
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The trunks eventually deliver lymph to one of two large ducts in the thoracic region of the body Lymphatic Ducts: Right lymphatic duct : Thoracic duct: cisterna chyli:
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