File:Lymphatic capillary.jpg
From Embryology
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Lymphatic Vessels
- Lymphatic vessels, unlike blood vessels, only carry fluid away from the tissues.
- The smallest lymphatic vessels are the lymph capillaries, 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.
Lymph Vessel Network
- The microscopic lymph capillaries merge to form lymphatic vessels.
- Small lymphatic vessels join to form larger tributaries, called lymphatic trunks, which drain large regions.
- Lymphatic trunks merge until the lymph enters the two lymphatic ducts.
- right lymphatic duct drains lymph from the upper right quadrant of the body.
- thoracic duct drains all the rest.
Lymph Flow
- Like veins, the lymphatic tributaries have thin walls and have valves to prevent backflow of blood.
- There is no pump in the lymphatic system like the heart in the cardiovascular system.
- The pressure gradients to move lymph through the vessels come from the skeletal muscle action, respiratory movement, and contraction of smooth muscle in vessel walls.
Image and Text Source: National Cancer Institute - SEER Training Modules
http://training.seer.cancer.gov/anatomy/lymphatic/components/
File history
Yi efo/eka'e gwa ebo wo le nyangagi wuncin ye kamina wunga tinya nan
Gwalagizhi | Nyangagi | Dimensions | User | Comment | |
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current | 14:29, 14 February 2013 | 690 × 400 (69 KB) | Z8600021 (talk | contribs) | enlarged image for lecture. | |
09:46, 22 December 2010 | 497 × 288 (56 KB) | S8600021 (talk | contribs) | ==Lymphatic Vessels== :"Lymphatic vessels, unlike blood vessels, only carry fluid away from the tissues. The smallest lymphatic vessels are the lymph capillaries, which begin in the tissue spaces as blind-ended sacs. Lymph capillaries are found in all re |
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