Lymph capillary: Difference between revisions
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{{Short description|Microvessel serving to drain and process extracellular fluid}} |
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{{Infobox lymph |
{{Infobox lymph |
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| Name = |
| Name = Lymph capillary |
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| Latin = vas lymphocapillare |
| Latin = vas lymphocapillare |
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| Image = Illu lymph capillary.png |
| Image = Illu lymph capillary.png |
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| Caption = Diagram showing the formation of [[lymph]] from [[interstitial fluid]] (labeled here as "Tissue fluid" |
| Caption = Diagram showing the formation of [[lymph]] from [[interstitial fluid]] (labeled here as "Tissue fluid") |
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| Image2 = |
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| Caption2 = |
| Caption2 = |
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'''Lymph capillaries''' or '''lymphatic capillaries''' are tiny, thin-walled [[microvessel]]s located in the spaces between [[Cell (biology)|cells]] (except in the [[central nervous system]] and non-vascular [[tissue (biology)|tissues]]) which serve to drain and process [[ |
'''Lymph capillaries''' or '''lymphatic capillaries''' are tiny, thin-walled [[microvessel]]s located in the spaces between [[Cell (biology)|cells]] (except in the [[central nervous system]] and non-vascular [[tissue (biology)|tissues]]) which serve to drain and process [[extracellular fluid]]. Upon entering the [[lumen (anatomy)|lumen]] of a lymphatic capillary, the collected fluid is known as [[lymph]]. Each lymphatic capillary carries lymph into a [[lymphatic vessel]], which in turn connects to a [[lymph node]], a small bean-shaped gland that filters and monitors the lymphatic fluid for infections.<ref name="Lymphatic System">{{cite web|last=|first=|date=|title=Lymphatic System|url=https://my.clevelandclinic.org/health/articles/21199-lymphatic-system|archive-url=|archive-date=|access-date=|website=Cleveland Clinic|ref=1}}</ref> Lymph is ultimately returned to the [[vein|venous circulation]]. |
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Lymphatic capillaries are slightly larger in diameter than [[blood capillaries]], and have closed ends (unlike the loop structure of blood capillaries). Their unique structure permits [[interstitial fluid]] to flow into them but not out. The ends of the [[Endothelium|endothelial cells]] that make up the wall of a lymphatic capillary overlap. When pressure is greater in the interstitial fluid than in lymph, the cells separate slightly, like the opening of a one-way swinging door, and interstitial fluid enters the lymphatic capillary. When pressure is greater inside the lymphatic capillary, the cells adhere more closely, and lymph cannot escape back into interstitial fluid. Attached to the lymphatic capillaries are anchoring filaments, which contain elastic fibers. They extend out from the lymphatic capillary, attaching lymphatic endothelial cells to surrounding tissues. When excess |
Lymphatic capillaries are slightly larger in diameter than [[blood capillaries]], and have closed ends (unlike the loop structure of blood capillaries). Lymph capillaries are strategically placed among the blood-related capillaries in order to have efficient and effective uptake from the interstitial fluid during capillary exchange. This intentional formation allows for a more rapid and continuous collection.<ref>{{cite journal |last1=Leak |first1=LV |title=The structure of lymphatic capillaries in lymph formation. |journal=Federation Proceedings |date=June 1976 |volume=35 |issue=8 |pages=1863–71 |pmid=1269772}}</ref> Their unique structure permits [[interstitial fluid]] to flow into them but not out. The ends of the [[Endothelium|endothelial cells]] that make up the wall of a lymphatic capillary overlap. When pressure is greater in the interstitial fluid than in lymph, the cells separate slightly, like the opening of a one-way swinging door, and interstitial fluid enters the lymphatic capillary. When pressure is greater inside the lymphatic capillary, the cells adhere more closely, and lymph cannot escape back into the interstitial fluid. Attached to the lymphatic capillaries are anchoring filaments, which contain elastic fibers. They extend out from the lymphatic capillary, attaching lymphatic endothelial cells to surrounding tissues. When excess interstitial fluid accumulates and causes tissue swelling, the anchoring filaments are pulled, making the openings between cells even larger so that more fluid can flow into the lymphatic capillary.<ref>Tortora, Gerard J.: "Principles of Human Anatomy - 10th edition", page 512. John Wiley and Sons, Inc., 2005. lymph enters the lymph capillaries by osmosis</ref> |
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Lymph capillaries have a greater internal [[oncotic pressure]] than blood capillaries, due to the greater concentration of [[plasma protein]]s |
Lymph capillaries have a greater internal [[oncotic pressure]] than blood capillaries, due to the greater concentration of [[plasma protein]]s present. |
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==Clinical importance== |
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In the small intestine, lymphatic capillaries called [[lacteal]]s are critical for the transport of dietary lipids and lipid-soluble vitamins to the bloodstream. In the small intestine, dietary [[triglyceride]]s combine with other lipids and proteins, and enter the lacteals to form a milky fluid called [[chyle]]. The chyle then travels through the lymphatic system, eventually entering the bloodstream.<ref name="Openstax Anatomy & Physiology attribution">{{CC-notice|cc=by4|url=https://openstax.org/books/anatomy-and-physiology/pages/21-1-anatomy-of-the-lymphatic-and-immune-systems}} {{cite book|last1=Betts|first1=J Gordon|last2=Desaix|first2=Peter|last3=Johnson|first3=Eddie|last4=Johnson|first4=Jody E|last5=Korol|first5=Oksana|last6=Kruse|first6=Dean|last7=Poe|first7=Brandon|last8=Wise|first8=James|last9=Womble|first9=Mark D|last10=Young|first10=Kelly A|title=Anatomy & Physiology|location=Houston|publisher=OpenStax CNX|isbn=978-1-947172-04-3|date=August 6, 2023|at=21.1 Anatomy of the lymphatic and immune systems}}</ref> |
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==References== |
==References== |
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{{Arteries and veins}} |
{{Arteries and veins}} |
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{{Lymphatic flow}} |
{{Lymphatic flow}} |
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{{Authority control}} |
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{{DEFAULTSORT:Lymph Capillary}} |
{{DEFAULTSORT:Lymph Capillary}} |
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Latest revision as of 07:48, 7 June 2024
| Lymph capillary | |
|---|---|
 Diagram showing the formation of lymph from interstitial fluid (labeled here as "Tissue fluid") | |
| Details | |
| System | Lymphatic system |
| Identifiers | |
| Latin | vas lymphocapillare |
| TA98 | A12.0.00.044 |
| TA2 | 3918 |
| TH | H3.09.02.0.05004 |
| FMA | 5028 |
| Anatomical terminology | |
Lymph capillaries or lymphatic capillaries are tiny, thin-walled microvessels located in the spaces between cells (except in the central nervous system and non-vascular tissues) which serve to drain and process extracellular fluid. Upon entering the lumen of a lymphatic capillary, the collected fluid is known as lymph. Each lymphatic capillary carries lymph into a lymphatic vessel, which in turn connects to a lymph node, a small bean-shaped gland that filters and monitors the lymphatic fluid for infections.[1] Lymph is ultimately returned to the venous circulation.
Lymphatic capillaries are slightly larger in diameter than blood capillaries, and have closed ends (unlike the loop structure of blood capillaries). Lymph capillaries are strategically placed among the blood-related capillaries in order to have efficient and effective uptake from the interstitial fluid during capillary exchange. This intentional formation allows for a more rapid and continuous collection.[2] Their unique structure permits interstitial fluid to flow into them but not out. The ends of the endothelial cells that make up the wall of a lymphatic capillary overlap. When pressure is greater in the interstitial fluid than in lymph, the cells separate slightly, like the opening of a one-way swinging door, and interstitial fluid enters the lymphatic capillary. When pressure is greater inside the lymphatic capillary, the cells adhere more closely, and lymph cannot escape back into the interstitial fluid. Attached to the lymphatic capillaries are anchoring filaments, which contain elastic fibers. They extend out from the lymphatic capillary, attaching lymphatic endothelial cells to surrounding tissues. When excess interstitial fluid accumulates and causes tissue swelling, the anchoring filaments are pulled, making the openings between cells even larger so that more fluid can flow into the lymphatic capillary.[3]
Lymph capillaries have a greater internal oncotic pressure than blood capillaries, due to the greater concentration of plasma proteins present.
Clinical importance
[edit]In the small intestine, lymphatic capillaries called lacteals are critical for the transport of dietary lipids and lipid-soluble vitamins to the bloodstream. In the small intestine, dietary triglycerides combine with other lipids and proteins, and enter the lacteals to form a milky fluid called chyle. The chyle then travels through the lymphatic system, eventually entering the bloodstream.[4]
References
[edit]- ^ "Lymphatic System". Cleveland Clinic.
- ^ Leak, LV (June 1976). "The structure of lymphatic capillaries in lymph formation". Federation Proceedings. 35 (8): 1863–71. PMID 1269772.
- ^ Tortora, Gerard J.: "Principles of Human Anatomy - 10th edition", page 512. John Wiley and Sons, Inc., 2005. lymph enters the lymph capillaries by osmosis
- ^
This article incorporates text available under the CC BY 4.0 license. Betts, J Gordon; Desaix, Peter; Johnson, Eddie; Johnson, Jody E; Korol, Oksana; Kruse, Dean; Poe, Brandon; Wise, James; Womble, Mark D; Young, Kelly A (August 6, 2023). Anatomy & Physiology. Houston: OpenStax CNX. 21.1 Anatomy of the lymphatic and immune systems. ISBN 978-1-947172-04-3.
