sinusoid

(noun)

Any of several channels through which venous blood passes in various organs.

Related Terms

  • hepatic portal system
  • hepatocyte
  • trophoblastic lacunae
  • vitelline veins

Examples of sinusoid in the following topics:

  • Sinusoid Development

    • The sinusoids are capillaries that develop after implantation to allow the exchange of gas and nutrients with the mother.
    • A sinusoid is a small blood vessel that is a type of capillary similar to a fenestrated endothelium.
    • Sinusoids are actually classified as a type of open pore capillary (that is, discontinuous) as opposed to fenestrated.
    • Sinusoids are found in the liver, lymphoid tissue, endocrine organs, and hematopoietic organs, such as the bone marrow and the spleen.
    • Sinusoids found within the terminal villi of the placenta are not comparable to these because they possess a continuous endothelium and complete basal lamina.
  • Capillaries

    • Sinusoidal - Sinusoidal capillaries are a special type of fenestrated capillaries that have larger openings (30-40 μm in diameter) in the endothelium.
    • Sinusoid blood vessels are primarily located in the bone marrow, lymph nodes, and adrenal gland.
    • Some sinusoids are special in that they do not have tight junctions between cells.
    • These are called discontinuous sinusoidal capillaries, present in the liver and spleen where greater movement of cells and materials is necessary.
  • Hepatic Portal Circulation

    • Blood from either source passes into cavities between the hepatocytes of the liver called sinusoids, which feature a fenestrated, discontinuous endothelium allowing for the effecient transfer and processing of nutrients in the liver.
    • Sinusoid of a rat liver with fenestrated endothelial cells.
    • Fenestrae are approx 100nm diameter, and sinusoidal width 5 microns.
  • Histology of the Liver and Gallbladder

    • Hepatocytes are organized into plates separated by vascular channels (sinusoids) for blood vessels.
  • Absorptive State

    • Some are used to make plasma proteins, but most leave through liver sinusoids to be used by body cells to construct proteins.
  • Supply of Blood and Nerves to Bone

    • The vascular supply of long bones depends on several points of inflow, which feed complex sinusoidal networks within the bone.
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