Schaeberle, Cheryl Department of Anatomy and Cellular Biology, Tufts University School of Medicine, Boston, Massachusetts.
- Amniote egg
- Development and structure
- Related Primary Literature
- Additional Reading
Any of four membranous structures surrounding the embryo during its developmental period. Because these membranes are external to the embryo proper, they are called extraembryonic membranes. Throughout embryonic development, every embryo must contend with a few basic needs. All developing animals need some source of nutrition, a way to remove wastes, some form of respiration, and protection from the outside environment. Fetal membranes collectively serve these functions.
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