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Related Concept Videos

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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.
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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.
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Fluid dynamics is the study of fluids in motion. Velocity vectors are often used to illustrate fluid motion in applications like meteorology. For example, wind—the fluid motion of air in the atmosphere—can be represented by vectors indicating the speed and direction of the wind at any given point on a map. Another method for representing fluid motion is a streamline. A streamline represents the path of a small volume of fluid as it flows. When the flow pattern changes with time, the...
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Related Experiment Video

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Blocking Lymph Flow by Suturing Afferent Lymphatic Vessels in Mice
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An Image-Based Model of Fluid Flow Through Lymph Nodes.

Laura J Cooper1,2, James P Heppell3, Geraldine F Clough4,5

  • 1Faculty of Engineering and the Environment, University of Southampton, Highfield Campus, Southampton, SO17 1BJ, UK. laura.cooper@soton.ac.uk.

Bulletin of Mathematical Biology
|December 23, 2015
PubMed
Summary

This study models fluid flow within lymph nodes using microscopy images. The findings reveal direct flow pathways and absorption/filtration across blood vessels, influenced by efferent lymphatic pressure.

Keywords:
Finite element modellingImage-based modellingLymph nodesPorous media

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Area of Science:

  • Biomedical Engineering
  • Physiology
  • Immunology

Background:

  • The lymphatic system maintains tissue fluid balance by returning fluid to the bloodstream.
  • Lymph nodes filter this fluid, but internal flow dynamics are poorly understood.
  • Experimental measurement of lymph node internal flow is challenging.

Purpose of the Study:

  • To develop an image-based model to investigate how lymph node internal structure influences fluid flow pathways.
  • To quantify lymph node interstitial permeability using experimental data and numerical simulations.

Main Methods:

  • Utilized Selective Plane Illumination Microscopy (SPIM) images of murine lymph nodes to define internal geometry.
  • Developed a computational model using finite element analysis (COMSOL Multiphysics).
  • Integrated experimental data for boundary conditions and parameter optimization.

Main Results:

  • Estimated average lymph node tissue permeability to be on the order of [Formula: see text].
  • Demonstrated that lymphatic fluid predominantly flows directly between afferent and efferent vessels.
  • Showed fluid filtration and absorption occur across blood vessel boundaries, dependent on efferent lymphatic pressure.

Conclusions:

  • Image-based modeling provides insights into lymph node internal fluid dynamics.
  • Lymph node structure dictates primary flow routes and interaction with vasculature.
  • Understanding these dynamics is crucial for lymphatic system function and fluid homeostasis.