The extraembryonic membrane that gives rise to the umbilical cord is the
A)yolk sac.
B)allantois.
C)amnion.
D)chorion.
E)decidua.

Question

Quizplus · Accepted Answer

The allantois is an extraembryonic membrane that extends from the early gut of the developing embryo and eventually forms the umbilical cord. The yolk sac is involved in early nutrient transfer but does not contribute to the umbilical cord. The amnion forms a fluid-filled sac that surrounds and protects the developing embryo, but is not involved in the formation of the umbilical cord. The chorion is the outermost membrane surrounding the embryo and contributes to the placenta, but does not form the umbilical cord. The decidua refers to the uterine lining that contributes to the placenta, but is not an extraembryonic membrane.

The Extraembryonic Membrane That Gives Rise to the Umbilical Cord