^

Health

A
A
A

Lymphatic capillaries

 
, medical expert
Last reviewed: 19.11.2021
 
Fact-checked
х

All iLive content is medically reviewed or fact checked to ensure as much factual accuracy as possible.

We have strict sourcing guidelines and only link to reputable media sites, academic research institutions and, whenever possible, medically peer reviewed studies. Note that the numbers in parentheses ([1], [2], etc.) are clickable links to these studies.

If you feel that any of our content is inaccurate, out-of-date, or otherwise questionable, please select it and press Ctrl + Enter.

Lymphatic capillaries (vasa lymphocapilldria) are the initial link - the "roots" of the lymphatic system. They are present in all organs and tissues of the human body, except the brain and spinal cord, their membranes, the eyeball, the inner ear, the epithelial cover of the skin and mucous membranes, cartilage, spleen parenchyma, bone marrow and placenta. Unlike blood capillaries, lymphocapillaries have a larger diameter (from 0.01 to 0.2 mm), uneven contours, lateral protrusions. When combined with each other, they form closed lymphocapillary nets (organs and tissues) in organs and tissues (rete lymphocapillar). The loops of these nets lie in one or several planes, depending on the structure (structure) of the organ in which they are located. The orientation of the capillaries corresponds to the direction of the bundles of connective tissue, in which the lymphatic capillaries overlap. So, in volumetric organs (muscles, lungs, liver, kidneys, large glands, etc.) lymphocapillary nets have a three-dimensional structure. Lymphatic capillaries in them are oriented in different directions, located between structural and functional elements of the organ: bundles of muscle fibers, groups of glandular cells, renal corpuscles and tubules, hepatic lobules. In flat organs (fascia, serous membranes, skin, layers of walls of hollow organs, walls of large blood vessels), lymphocapillary nets are located in one plane parallel to the surface of the organ. In some organs, the network of lymphatic capillaries forms finger-like long blind protrusions (for example, lymphatic sinuses in villi of the small intestine).

The walls of the lymphatic capillaries are constructed from a single layer of endothelial cells. These cells are attached to a number of lying bundles of collagen fibers with the help of beams of the finest fiber-rope (anchor) filaments. Such a connection between collagen fibers and the walls of the lymphatic capillaries promotes the opening of the luminal capillaries, especially in swelling of the tissues in which these capillaries are located. Lymphatic capillaries with valves are considered as lymphatic post-capillaries.

trusted-source[1], [2], [3], [4], [5], [6], [7], [8], [9], [10], [11]

Translation Disclaimer: For the convenience of users of the iLive portal this article has been translated into the current language, but has not yet been verified by a native speaker who has the necessary qualifications for this. In this regard, we warn you that the translation of this article may be incorrect, may contain lexical, syntactic and grammatical errors.

You are reporting a typo in the following text:
Simply click the "Send typo report" button to complete the report. You can also include a comment.