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Related Concept Videos

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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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

Development of the Lymphatic System

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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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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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Fluid Connective Tissues: Blood and Lymph01:20

Fluid Connective Tissues: Blood and Lymph

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Blood and lymph are fluid connective tissues. They contain cells, also known as formed elements, circulating in a liquid extracellular matrix, the plasma. The formed elements are derived from hematopoietic stem cells in the bone marrow. Blood and lymph connect all vital parts and carry nutrients, oxygen, and other essential molecules like antibodies.
Blood
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Functions of the Lymphatic and Immune System01:28

Functions of the Lymphatic and Immune System

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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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Related Experiment Video

Updated: Sep 3, 2025

Blocking Lymph Flow by Suturing Afferent Lymphatic Vessels in Mice
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Blocking Lymph Flow by Suturing Afferent Lymphatic Vessels in Mice

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Lymphatic Vascular Permeability.

Joshua P Scallan1, Melanie Jannaway1

  • 1Department of Molecular Pharmacology and Physiology, Morsani College of Medicine, University of South Florida, Tampa, Florida 33612, USA.

Cold Spring Harbor Perspectives in Medicine
|July 25, 2022
PubMed
Summary
This summary is machine-generated.

Lymphatic vessels, crucial for fluid balance and immune function, are now understood to be permeable. This permeability is vital for absorbing and transporting tissue fluid, with significant implications for health and disease.

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Last Updated: Sep 3, 2025

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Area of Science:

  • Physiology
  • Vascular Biology
  • Immunology

Background:

  • Blood vessels regulate fluid and solute transport, essential for cellular function.
  • The lymphatic vasculature, part of the immune system, plays a key role in tissue fluid homeostasis.
  • Recent discoveries highlight the permeability of lymphatic vessels, previously underestimated.

Purpose of the Study:

  • To review current knowledge on lymphatic vascular permeability.
  • To discuss the biophysical and signaling mechanisms governing lymphatic permeability.
  • To examine the relevance of lymphatic permeability in disease states.

Main Methods:

  • Literature review of recent findings on lymphatic vascular permeability.
  • Analysis of biophysical and molecular signaling pathways.
  • Examination of clinical and pathological implications.

Main Results:

  • Lymphatic vessels possess regulated permeability essential for fluid absorption and transport.
  • Specific biophysical forces and signaling pathways control lymphatic permeability.
  • Dysregulation of lymphatic permeability is implicated in various diseases, including lymphedema and inflammation.

Conclusions:

  • Lymphatic vascular permeability is a critical, recently recognized property with broad physiological and pathological significance.
  • Understanding these mechanisms offers potential therapeutic targets for fluid-related disorders and immune modulation.