The vitelline veins are veins that drain blood from the yolk sac[1] and the gut tube[2] during gestation.
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.
The vitelline veins give rise to:[4]
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.[3] 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.
The vitelline veins drain the yolk sac during early embryonic development.[1][5] They also drain the gut tube in embryos once this has formed from the yolk sac.[2][6]
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U.S. Air Force military education institution Not to be confused with United States Air Force Academy. This article is about the Army Air Force School of Applied Tactics established in 1943. For the Army Air Force School of Applied Tactics established in 1942, see Army Air Forces Tactical Center. Air UniversityTypeUniversity systemEstablished12 March 1946Parent institutionAir Education and Training CommandPresidentLt Gen Andrea TullosVice CommanderMaj Gen Parker H. WrightLocationMaxwell Air Forc…
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2nd President of Haiti (1818-43) This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: Jean-Pierre Boyer – news · newspapers · books · scholar · JSTOR (June 2014) (Learn how and when to remove this template message) Jean-Pierre Boyer2nd President of HaitiIn office30 March 1818 – 13 February 1843Preceded by…
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