 | This articleneeds additional citations forverification. Please helpimprove this article byadding citations to reliable sources in this article. Unsourced material may be challenged and removed. Find sources: "Vitelline veins" – news ·newspapers ·books ·scholar ·JSTOR(November 2020) (Learn how and when to remove this message) |
| Vitelline veins | |
|---|---|
 | |
| Details | |
| Carnegie stage | 9 |
| Days | 28 |
| Identifiers | |
| Latin | vena vitellina |
| FMA | 70305 |
| Anatomical terminology | |
Thevitelline veins are veins that drain blood from theyolk sac[1] and thegut tube[2] duringgestation.
They run upward at first in front, and subsequently on either side of theintestinal canal. They unite on theventral aspect of the canal.
Beyond this, they are connected to one another by twoanastomotic branches, one on the dorsal, and the other on the ventral aspect of theduodenal portion of theintestine. This is encircled by twovenous rings; into the middle or dorsal anastomosis thesuperior mesenteric vein opens.
The portions of the veins above the upper ring become interrupted by the developingliver and broken up by it into a plexus of small capillary-like vessels termedsinusoids.
The vitelline veins give rise to:[4]
The branches conveying the blood to the plexus are named thevenae advehentes, and become the branches of theportal vein. The vessels draining the plexus into the sinus venosus are termed thevenae revehentes, and form the futurehepatic 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 theportal vein.
The vitelline veins drain theyolk sac during earlyembryonic development.[1][5] They also drain thegut tube inembryos once this has formed from the yolk sac.[2][6]
