Lymphatic system Final1 - The Lymphatic System Lymphatic...

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Unformatted text preview: The Lymphatic System Lymphatic System: Overview • Consists of two semi-independent parts – A meandering network of lymphatic vessels Lymphatic System: Overview • Consists of two semi-independent parts – Lymphoid tissues and organs scattered throughout the body Lymphatic System: Overview • Consists of two semi-independent parts – Lymphoid tissues and organs scattered throughout the body Lymphatic System: Overview • Consists of two semi-independent parts – Lymphoid tissues and organs scattered throughout the body Where is Interstitial fluid found? Lymphatic System: Overview • Returns interstitial fluid and leaked plasma proteins back to the blood Lymphatic System: Overview • Returns interstitial fluid and leaked plasma proteins back to the blood Lymphatic System: Overview • Lymph – interstitial fluid once it has entered lymphatic vessels Lymphatic System: Overview • Lymph – interstitial fluid once it has entered lymphatic vessels Lymphatic Vessels • A one-way system in which lymph flows toward the heart Lymphatic Vessels • Lymph vessels include: – Microscopic, permeable, blind-ended capillaries • Lymphatic capillary—closed at one end Tissue or Cell Lymph fluid fluid Lymphatic Vessels • Lymph vessels include: – Microscopic, permeable, blind-ended capillaries Lymphatic Vessels • Lymph vessels include: – Lymphatic collecting vessels Lymphatic Vessels • Lymph vessels include: – Trunks and ducts Lymphatic Capillaries • Similar to blood capillaries, with modifications – Remarkably permeable Lymphatic Capillaries • Similar to blood capillaries, with modifications – Loosely joined endothelial minivalves Lymphatic Capillaries • Similar to blood capillaries, with modifications – Withstand interstitial pressure and remain open Lymphatic Capillaries • The minivalves function as one-way gates that: – Allow interstitial fluid to enter lymph capillaries – Do not allow lymph to escape from the capillaries Lymphatic Capillaries • During inflammation, lymph capillaries can absorb: – Cell debris Lymphatic Capillaries • During inflammation, lymph capillaries can absorb: – Pathogens Lymphatic Capillaries • During inflammation, lymph capillaries can absorb: – Cancer cells • Aselli's discovery of the lymphatic vessels was made during the dissection of a well-fed dog. Aselli observed white threads covering the lining of the abdominal cavity and the intestines which oozed a white fluid when cut. The vessels Aselli identified as the lacteals, the lymph channels of the intestines. Lymphatic Capillaries • Lacteals – specialized lymph capillaries present in intestinal mucosa – Absorb digested fat and deliver chyle to the blood Lymphatic Trunks • Lymphatic trunks are formed by the union of the largest collecting ducts Lymph capillaries converge to become collecting vessels and end up as either Thoracic duct or right lymphatic duct Thoracic (left lymphatic) duct Left subclavian vein Right lymphatic duct Right subclavian vein Cysterna Chyli Lymphatic Trunks...
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This note was uploaded on 10/10/2011 for the course ZOO 3733 taught by Professor Sa during the Spring '07 term at University of Central Florida.

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Lymphatic system Final1 - The Lymphatic System Lymphatic...

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