The following table or figure may be downloaded to PowerPoint for personal use in teaching and presentations. This feature is available to all subscribers to the journal.

You MUST read and follow the guidelines at Request to Reproduce AJR Content if you are distributing or using AJR content beyond academic use (limited distribution, non-revenue producing, or educational purposes).

(Downloading may take up to 30 seconds.
If the slide opens in your browser, select File -> Save As to save it.)
Click on image to view larger version.

Fig. 1. —Illustration shows hemodynamic theory for umbilical flow in embryo at 6 weeks' gestation. Arrow shows direction of flow. 1 = sinus venosus, 2 = common cardinal vein, 3 = posterior cardinal vein, 4 = parietal embryonic vein, 5 = superior mesenteric vein, 6 = vitelline vein, 7 = vitellomesenteric trunk, 8 = left umbilical vein, 9 = vitelloumbilical anastomosis, 10 = right umbilical vein, 11 = umbilical anastomosis, 12 = common prehepatic umbilical vein, 13 = liver, 14 = intestine beyond umbilical loop. (Reprinted with permission from [18].)