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Lymphatic Vessels and Lymph Transport01:16

Lymphatic Vessels and Lymph Transport

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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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Detailed Structure and Function of Lymph Nodes01:23

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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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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.
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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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Functions of the Lymphatic and Immune System01:28

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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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Liver Histology01:27

Liver Histology

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The microscopic anatomy of the liver is a complex and intricate system that comprises numerous structural units known as liver lobules, each of which is comparable in size to a sesame seed. These hexagonal structures consist of plates of liver cells or hepatocytes, which are characterized by their versatility and abundance of cellular apparatus like rough and smooth ER, Golgi apparatus, peroxisomes, and mitochondria.
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The Hepatic Lymphatic Vascular System: Structure, Function, Markers, and Lymphangiogenesis.

Masatake Tanaka1, Yasuko Iwakiri1

  • 1Section of Digestive Diseases, Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut.

Cellular and Molecular Gastroenterology and Hepatology
|January 21, 2017
PubMed
Summary

The liver's lymphatic vascular system, crucial for fluid balance, is increasingly understood. Research shows lymphatic vessel dysfunction contributes significantly to liver disease pathogenesis.

Keywords:
CCl4, carbon tetrachlorideCirrhosisEHE, epithelioid hemangioendotheliomaHA, hyaluronanHBx Ag, hepatitis B x antigenHCC, hepatocellular carcinomaIFN, interferonIL, interleukinInflammationLSEC, liver sinusoidal endothelial cellLYVE-1, lymphatic vessel endothelial hyaluronan receptor 1LyEC, lymphatic endothelial cellNO, nitric oxidePortal HypertensionProx1, prospero homeobox protein 1VEGFVEGF, vascular endothelial growth factorVEGFR, vascular endothelial growth factor receptormTOR, mammalian target of rapamycin

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Area of Science:

  • Vascular Biology
  • Hepatology
  • Lymphatic System Research

Background:

  • The hepatic lymphatic vascular system's role in fluid homeostasis is vital but understudied.
  • Recent advances in lymphatic endothelial cell markers have accelerated lymphatic research.
  • Lymphatic vessel dysfunction is implicated in the pathogenesis of numerous diseases.

Purpose of the Study:

  • To review current knowledge on hepatic lymphatic vascular structure and function.
  • To discuss markers specific to liver lymphatic endothelial cells.
  • To explore factors driving liver lymphangiogenesis and compare hepatic lymphatics to those in other organs.

Main Methods:

  • Literature review of recent advancements in lymphatic vascular research.
  • Analysis of specific markers for lymphatic endothelial cells.
  • Comparative analysis of hepatic lymphatics with lymphatics in other tissues.

Main Results:

  • The lymphatic vascular system plays a critical role in maintaining liver fluid homeostasis.
  • Specific markers have enabled detailed study of liver lymphatics through advanced imaging and cell isolation.
  • Evidence strongly links lymphatic vessel dysfunction to liver disease development.

Conclusions:

  • Understanding hepatic lymphatics is crucial for comprehending liver physiology and pathology.
  • Further research into liver lymphangiogenesis and lymphatic function is warranted.
  • Comparative studies highlight unique aspects of the liver's lymphatic system.