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Related Concept Videos

Detailed Structure and Function of Lymph Nodes01:23

Detailed Structure and Function of Lymph Nodes

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Lymph nodes are bean-shaped structures that cluster along the lymphatic vessels in the inguinal, axillary, and cervical regions. Each node is divided into compartments by a capsule that extends trabeculae inward.
From a histological perspective, lymph nodes can be split into two main areas: the superficial cortex and the deep medulla. The outer cortex is populated by dendritic cells, macrophages, and B lymphocytes, which are densely packed into follicles. When these B-lymphocytes are presented...
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Lymphatic Vessels and Lymph Transport01:16

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Lymphatic vessels, known as lymphatics, are crucial in transporting lymph from peripheral tissues to our venous system. This process begins with lymph entering through tiny capillaries that branch through tissues. These capillaries have unique features such as larger diameters, thinner walls, and a distinctive one-way valve system formed by overlapping endothelial cells.
This one-way system allows fluids, solutes, and even pathogens to enter but prevents their return to the intercellular...
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Lymphoid Cells and Tissues01:18

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Lymphoid cells and tissues are integral to the immune system, which is crucial in maintaining our body's defense against harmful pathogens. They form the building blocks of lymphoid organs, which include the spleen, thymus, and lymph nodes.
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The lymphatic system plays a crucial role in bolstering our immune system. It consists of a network of lymphoid organs, lymph, and lymphatic vessels that provide structural and functional support in safeguarding the body against pathogens such as viruses and bacteria.
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Overview of the Vascular System01:20

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The vascular system comprises an extensive network of arteries, capillaries, and veins. The vascular system can be broadly divided into the blood and lymphatic systems. Typically, blood vessels can be categorized into three histological regions: tunica intima, tunica media, and tunica adventitia. The tunica intima consists of a single layer of endothelial cells attached to the basal lamina. Underlying the basal lamina is a connective tissue layer and an elastic lamina that gives stability and...
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Development of the Lymphatic System01:15

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The development of lymphatic tissues and vessels in embryonic life begins around the fifth week. These structures originate from the mesoderm layer, with lymph sacs emerging from developing veins.
The first lymph sacs to form are the paired jugular lymph sacs located at the junction of the internal jugular and subclavian veins. From these sacs, lymphatic capillary plexuses extend to the thorax, upper limbs, neck, and head, eventually forming lymphatic vessels. Each jugular lymph sac maintains a...
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Related Experiment Video

Updated: Dec 27, 2025

Isolation of Murine Lymph Node Stromal Cells
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Lymphatic endothelial cells of the lymph node.

Sirpa Jalkanen1,2, Marko Salmi3,4

  • 1MediCity Research Laboratory, University of Turku, Turku, Finland.

Nature Reviews. Immunology
|February 26, 2020
PubMed
Summary

Lymph node sinus endothelial cells exhibit diverse structures and functions, regulating immune cell and antigen traffic. These cells are crucial for immune responses in lymph nodes during health, inflammation, and cancer.

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Area of Science:

  • Immunology
  • Cell Biology
  • Anatomy

Background:

  • Lymph nodes are critical sites for immune responses, filtering antigens and cells from the body.
  • The sinus system within lymph nodes facilitates the movement of cells and antigens.
  • Lymphatic endothelial cells (LECs) form the sinus walls, acting as a barrier and signaling hub.

Purpose of the Study:

  • To review the structural and functional diversity of lymphatic endothelial cells in lymph node sinuses.
  • To explore the role of sinus LECs in regulating immune cell and antigen trafficking.
  • To discuss the involvement of sinus LECs in immune responses during physiological and pathological conditions.

Main Methods:

  • Review of recent studies analyzing mouse and human lymph node sinus structures.
  • Examination of the functional roles of lymphatic endothelial cells in antigen presentation and cell migration.
  • Analysis of intercellular communication between sinus LECs and other sinus-resident cells.

Main Results:

  • Discovery of significant diversity among lymphatic endothelial cells forming distinct sinus regions.
  • Identification of LECs as semipermeable barriers that sort lymph-borne antigens.
  • Demonstration that LECs can act as antigen-presenting cells and regulate leukocyte migration.
  • Highlighting the role of sinus LECs in lymph node organogenesis and niche formation through bidirectional signaling with macrophages.

Conclusions:

  • Lymph node sinus endothelial cells are key regulators of immune cell and antigen flow.
  • The diversity and signaling capacity of sinus LECs are fundamental to coordinating immune responses.
  • Understanding sinus LECs offers insights into immune system function in health, inflammation, and cancer.