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glossary:lymph_vessel

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glossary:lymph_vessel [2008/05/15 17:12]
Pat O'Connor
glossary:lymph_vessel [2012/10/16 14:40] (current)
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 +====== Lymph Vessel ======
  
 +A tubular passage for conveying [[lymph]]. [[Lymphatic vessels]], unlike [[blood vessel]]s, only carry fluid away from the tissues. The smallest lymphatic vessels are the lymph capillaries ([[lymph capillary]]),​ which begin in the [[tissue]] spaces as blind-ended sacs. Lymph capillaries are found in all regions of the body except the [[bone marrow]], central nervous system, and tissues, such as the epidermis, that lack blood vessels. The wall of the lymph capillary is composed of [[endothelium]] in which the simple squamous cells overlap to form a simple one-way valve. This arrangement permits fluid to enter the capillary but prevents lymph from leaving the vessel.
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 +Lymph travels through the lymph capillaries to small lymph vessels. Like [[vein]]s, the walls of lymph vessels have smooth muscle that contracts and propels lymph away from the tissues. Lymph vessels contain valves that prevent lymph from flowing backward.
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 +The lymph vessels converge into two main collecting ducts: the shorter right lymphatic or [[lymph duct]] and the longer thoracic duct. The right lymphatic duct drains lymph from the right side of the head, neck, thorax, and right upper extremity into the right [[subclavian vein]]. Lymph from the rest of the body flows into the thoracic duct that empties into the left subclavian vein. The [[thoracic duct]] begins in the abdomen as an expanded sac called the [[cisterna chyli]]. When lymph empties into the veins, it forms [[plasma]] (the liquid part of [[blood]]).
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 +{{lymphvessel.jpg}}
glossary/lymph_vessel.txt ยท Last modified: 2012/10/16 14:40 (external edit)