In the human embryo the vitelline duct also known as the omphalomesenteric duct is a long narrow tube that joins the yolk sac to the midgut lumen of the developing fetus. It appears at the end of the fourth week when the yolk sac presents the appearance of a small pear-shaped vesicle (the umbilical vesicle).
This page contains content from the copyrighted Wikipedia article "Vitelline duct"; that content is used under the GNU Free Documentation License (GFDL). You may redistribute it, verbatim or modified, providing that you comply with the terms of the GFDL.
