Vitelline Duct

Vitelline Duct -- Connects the yolk sac to the embryo/fetus.
Yolk Sac -- An embryonal structure upon which the early embryo is located. The earliest embryonal heartbeat is detectable adjacent to this structure.
ZIFT -- Zygote IntraFallopian Transfer ...

First trimester umbilical cord and vitelline duct measurements using virtual reality.
Early Hum Dev. [Abstract] [Full-text] ...

Included in this tissue are the body-stalk and the vitelline duct - the former containing the allantoic diverticulum and the umbilical vessels, the latter forming the communication between the digestive tube and the yolk-sac.

See also: Pregnancy, Diagnosis, Fetus, During pregnancy, Umbilical cord