132. Lymphoid system. Overview. Structure of the wall of the lymphatic vessels. Main lymphatic vessels.
Covers the lymphatic system as part of both the circulatory and immune systems, listing its components: lymphoid organs, lymph nodes, vessels and lymph. Then describes the layers of the lymphatic vessel wall, from the endothelium with its one-way flap valves down to the adventitia. Finally sets out the main vessels, from capillaries and collecting vessels to the named lymphatic trunks, the thoracic duct and the right lymphatic duct, with the regions each drains.
Topic 27 of 36 in the MU Sofia syllabus for Anatomy (Cardiovascular system) (Medicine, Year 2). The free AceMed note covers it in 3 sections, about 290 words (2 min of reading), with 16 flashcards.
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LYMPHOID SYSTEM
Structure of the wall of lymphatic vessels
Main Lymphatic vessels :
LYMPHOID SYSTEM
The lymphatic System is a part of the circulatory system (It collects the excess body fluid and return it to the venous circulation) As well as a part of immune system (It circulates lymphocytes throughout the body).
Lymphatic system is composed of:
1. Lymphoid organs (thymus, bone marrow, spleen) Primary secondery
2. lymph nodes
3. Lymph vessels
4. lymph
Structure of the wall of lymphatic vessels
Lymphatic vessels form an extensive and complex inter-connected network of channels, which begin as “porous” blind-ended lymphatic capillaries in tissues of the body and converge to form a number of larger vessels, which ultimately connect with large veins in the root of the neck.
Main layers of the wall :
1. Endothelium :
innermost layer
Single layer of specialized cells
Creating flap-like structures, that act as one-way valves.
allow fluid to enter the lymphatic vessel but prevent blackflow.
2. Basement membrane :
Supportive layer
Beneath the endothelium.
3. Anchoring filaments :
Between endothelial cells and surrounding tissues.
Anchore the endothelial to tissues
4. Smooth muscle layer : contract to move the lymph.
5. Connective tissue layer
6. Adventita : contains collagen fibers
In large lymphatic vessels
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