Medical Portal Mediway.com

Medical Specializations, Medical Dictionary


  Molecules
  Diseases
  Books
  Medical Products
  First aid
  Medical Specializations
  Doctors' Listing
  Hospitals
  Pharma/Drug Companies
  Manufacturers of Surgical
  Instruments

  Medical Colleges
  Medical Associations
  Medical Dictionary
  Conferences & Exhibitions
  Image Gallery
  Video Library
  Home
  Contact Us

Medical Specializations


Optometry => Eye => Vein


Vein


Vein (anatomy), in anatomy, blood vessel that conducts the deoxygenated blood from the capillaries back to the heart. Three exceptions to this description exist: the pulmonary veins return blood from the lungs, where it has been oxygenated, to the heart; the portal veins receive blood from the pyloric, gastric, cystic, superior mesenteric, and splenic veins and, entering the liver, break up into small branches that pass through all parts of that organ; and the umbilical veins convey blood from the fetus to the mother's placenta. Veins enlarge as they proceed, gathering blood from their tributaries. They finally pour the blood through the superior and inferior venae cavae into the right atrium of the heart. Their coats are similar to those of the arteries, but thinner, and often transparent.

Back