vitelline circulation - ορισμός. Τι είναι το vitelline circulation
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Τι (ποιος) είναι vitelline circulation - ορισμός

Vitelline system

vitelline membrane         
  • Vitelline membrane in a bird egg (7)
  • Vitelline membrane in an amphibian egg (2)
  • Vitelline membrane in a fish egg (A)
  • Formation of Fertilization envelope from the Vitelline envelope
  • Parasitism and the Vitelline Membrane
A GLYCOPROTEIN-BASED STRUCTURE THAT LIES OUTSIDE THE PLASMA MEMBRANE AND SURROUNDS THE EGG BEFORE FERTILIZATION.
Vitelline layer
¦ noun Embryology a transparent membrane surrounding and secreted by the fertilized ovum, preventing the entry of further spermatozoa.
Vitelline membrane         
  • Vitelline membrane in a bird egg (7)
  • Vitelline membrane in an amphibian egg (2)
  • Vitelline membrane in a fish egg (A)
  • Formation of Fertilization envelope from the Vitelline envelope
  • Parasitism and the Vitelline Membrane
A GLYCOPROTEIN-BASED STRUCTURE THAT LIES OUTSIDE THE PLASMA MEMBRANE AND SURROUNDS THE EGG BEFORE FERTILIZATION.
Vitelline layer
The vitelline membrane or vitelline envelope is a structure surrounding the outer surface of the plasma membrane of an ovum (the oolemma) or, in some animals (e.g.
Vitelline arteries         
ANATOMICAL ENTITY
Arteria vitellina; Vitelline artery
The vitelline arteries are the arterial counterpart to the vitelline veins. Like the veins, they play an important role in the vitelline circulation of blood to and from the yolk sac of a fetus.

Βικιπαίδεια

Vitelline circulation

Vitelline circulation refers to the system of blood flowing from the embryo to the yolk sac and back again.

The yolk-sac is situated on the ventral aspect of the embryo; it is lined by endoderm, outside of which is a layer of mesoderm. It is filled with fluid, the vitelline fluid, which is utilized for the nourishment of the embryo during the earlier stages of its existence. Blood is conveyed to the wall of the sac by the vitelline arteries (a branch of the dorsal aorta), and after circulating through a wide-meshed capillary plexus, is returned by the vitelline veins to the tubular heart of the embryo. This constitutes the vitelline circulation, and by means of it nutritive material is absorbed from the yolk-sac and conveyed to the embryo.