Vitelline veins

Vitelline veins
The liver and the veins in connection with it, of a human embryo, twenty-four or twenty-five days old, as seen from the ventral surface. (Vitelline veins visible at center bottom.)
Details
Carnegie stage9
Days28
Identifiers
LatinVena vitellina
FMA70305
Anatomical terminology

The vitelline veins are veins that drain blood from the yolk sac[1] and the gut tube[2] during gestation.

Path

They run upward at first in front, and subsequently on either side of the intestinal canal. They unite on the ventral aspect of the canal.

Beyond this, they are connected to one another by two anastomotic branches, one on the dorsal, and the other on the ventral aspect of the duodenal portion of the intestine. This is encircled by two venous rings; into the middle or dorsal anastomosis the superior mesenteric vein opens.

The portions of the veins above the upper ring become interrupted by the developing liver and broken up by it into a plexus of small capillary-like vessels termed sinusoids.

Derivatives

The vitelline veins give rise to:[3]

The branches conveying the blood to the plexus are named the venae advehentes, and become the branches of the portal vein. The vessels draining the plexus into the sinus venosus are termed the venae revehentes, and form the future hepatic veins. Ultimately the left vena revehens no longer communicates directly with the sinus venosus, but opens into the right vena revehens. The persistent part of the upper venous ring, above the opening of the superior mesenteric vein, forms the trunk of the portal vein.

Function

The vitelline veins drain the yolk sac during early embryonic development.[1][4] They also drain the gut tube in embryos once this has formed from the yolk sac.[2][5]

Additional images

References

  1. 1 2 Carlson, Bruce M. (2014-01-01), "Development of the Vascular System", Reference Module in Biomedical Sciences, Elsevier, doi:10.1016/b978-0-12-801238-3.05459-3, ISBN 978-0-12-801238-3, retrieved 2020-11-14
  2. 1 2 Snarr, Brian S.; McQuinn, Tim C.; Wessels, Andy (2017-01-01), Polin, Richard A.; Abman, Steven H.; Rowitch, David H.; Benitz, William E. (eds.), "50 - Cardiovascular Development", Fetal and Neonatal Physiology (Fifth Edition), Elsevier, pp. 515–522.e2, doi:10.1016/b978-0-323-35214-7.00050-0, ISBN 978-0-323-35214-7, retrieved 2020-11-14
  3. ↑ "Vitelline veins: Derivatives". LifeHugger. Retrieved 2009-12-11.
  4. ↑ Maynard, Robert Lewis; Downes, Noel (2019-01-01), Maynard, Robert Lewis; Downes, Noel (eds.), "Chapter 14 - Liver", Anatomy and Histology of the Laboratory Rat in Toxicology and Biomedical Research, Academic Press, pp. 159–168, doi:10.1016/b978-0-12-811837-5.00014-9, ISBN 978-0-12-811837-5, retrieved 2020-11-14
  5. ↑ Mitchell, Barry; Sharma, Ram (2009-01-01), Mitchell, Barry; Sharma, Ram (eds.), "Chapter 6 - The cardiovascular system", Embryology (Second Edition), Churchill Livingstone, pp. 31–40, doi:10.1016/b978-0-7020-3225-7.50009-9, ISBN 978-0-7020-3225-7, retrieved 2020-11-14
This article is issued from Offline. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.