Which of the following is not an embryonic membrane?

Question

Quizplus · Accepted Answer

The blastulon is not an embryonic membrane. It is a stage in the early development of an embryo where a blastula, a ball of cells with a fluid-filled cavity called a blastocoel, is formed. The other options, amnion, chorion, and yolk sac, are all embryonic membranes. The amnion forms a fluid-filled sac that surrounds and protects the developing embryo. The chorion is an outer membrane that contributes to the formation of the placenta. The yolk sac plays a role in nourishing the developing embryo before the placenta takes over that function.

Which of the Following Is Not an Embryonic Membrane