Chapter 29, Problem 10CP

Summary Introduction

To review:

The formation and functions of amnion, yolk sac, and chorion.

Introduction:

Amnion, yolk sac, and chorion are parts developed from extraembryonic membrane. Amnion is a membranous covering over the embryo and is filled with amniotic fluid. Yolk sac is a membranous layer outside the embryo that provides nourishment; it is attached to umbilical opening and the embryo's midgut. Chorion is the part outside the embryo that later develops into placenta.