February 10 Lecture - February 10, 2009 The Lymphatic...

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February 10, 2009 The Lymphatic System - Involved in moving fluids throughout the body - Similar to Cardiovascular system, but has some exceptions: o Lymphatic circulatory system does not have a pump system to drive the fluid through it and it is not a closed circulatory system o Lymphatic system is a drainage system, somewhat parallel to the venus drainage system - Lymphatic system begins as small capillary structures o Capillaries are in direct contact with interstitial spaces and fluids of various tissues in the body o Capillaries merge with others to form larger vessels, and the larger vessels have a number of specialized structures Lymph nodes o Larger vessels will then combine to form larger lymphatic vessels, and eventually lead the lymphatic fluid back to the thoracic region which united with major veins of the body so the lymph can return to systemic circulation - All parts of the body are serviced by the lymphatic system, with a few exceptions o The brain is not serviced by the lymphatic system o The cornea of the eye is also not serviced by the lymphatic system - The lymphatic system includes a variety of structures besides lymph nodes: o Thymus o Spleen o Lymphoid tissue associated with GI tract o Three pairs of tonsil ( Pharyngeal tonsil, Palatine tonsil, and Lingual tonsil ) - These may also be involved in other systems The Lymphatic System Structure - Upper right side of the body is eventually drained by the right lymphatic duct and the duct unites with the right subclavian vein o This is the site at which lymph is added to the venus drainage just before it enters the heart - Lymphatic system is asymmetrical; the rest of the body is eventually drained by the thoracic duct , which unites with the left subclavian vein so that all of the lymph is returned to the venus blood just before the blood returns to heart - The lymphatic system has no pump to drive the fluid through the vessels so the lymph is moving at relatively low pressures, the larger lymphatic vessels do however contain valves o As the lymph moves through the collecting networks it passes through a number of lymph nodes in various regions Axillary lymph nodes : these service arm , thoracic wall, breast, and part of the upper abdominal wall Cervical lymph nodes: drain lymph from the scalp, facial region, pharynx, and nasal cavity
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Intestinal lymph nodes: drain many of the abdominal organs, particularly the gastrointestinal tract Inguinal lymph nodes: drain from the lower abdominal wall (legs and lower extremities, external genitalia) Pelvic (or iliac) lymph nodes: service many structures in the pelvic region
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This note was uploaded on 10/23/2011 for the course BIOL 2125 taught by Professor Dr.park during the Winter '02 term at A.T. Still University.

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February 10 Lecture - February 10, 2009 The Lymphatic...

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