File:Gray0475.jpg

Human Embryo Liver and Associated Veins

Human embryo, 24 or 25 days old (liver ventral surface view) Figure after His.

• ductus venosus - shunts approximately half the umbilical vein blood flow directly to the inferior vena cava.
• portal vein - carries blood from the gastrointestinal tract and spleen to the liver.
• left umbilical vein - carries oxygenated blood from the placenta to the embryo/fetus.
• right umbilical vein - vessel degenerates leaving a single (left) umbilical vein.
• vena revehentes - veins from the sinusoid vessels in the liver to the inferior vena cava, that later develop into the hepatic veins.

Links: Liver | Cardiovascular System Development

The Vitelline Veins run upward at first in front, and subsequently on either side of the intestinal canal. They unite on the ventral aspect of the canal, and beyond this 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, which is thus encircled by two venous rings (Fig. 475); 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 (Minot). The branches conveying the blood to this plexus are named the venæ advehentes, and become the branches of the portal vein; while the vessels draining the plexus into the sinus venosus are termed the venæ revehentes, and form the future hepatic veins (Figs. 475, 476). 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.

(Gray's text)

Gray - Cardiovascular: 448 Artery and vein | 458 Human embryo week 2 vascular | 459 Human embryo 14 days with yolk-sac

Gray's Images: Development | Lymphatic | Neural | Vision | Hearing | Somatosensory | Integumentary | Respiratory | Gastrointestinal | Urogenital | Endocrine | Surface Anatomy | iBook | Historic Disclaimer

Historic Disclaimer - information about historic embryology pages

Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)

iBook - Gray's Embryology

iTunes link | iBooks Store Description - an extract of the embryology content from Anatomy of the Human Body By Henry Gray Philadelphia: Lea & Febiger, 1918. Releases First Edition - Jan 2012 Second Edition - March 2012 Repaired formatting and image display issues related to Pad rotated display and minor editing issues. Print length 169 pages, 41.6 MB, Language English. The current website also includes numerous images from this textbook, see Anatomy of the Human Body by Henry Gray and Category:Gray's 1918 Anatomy. Note the also Historic Disclaimer.

Reference

Gray H. Anatomy of the human body. (1918) Philadelphia: Lea & Febiger.

Cite this page: Hill, M.A. (2024, April 19) Embryology Gray0475.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Gray0475.jpg

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