Fetal membrane

Medical Dictionary

fetal membrane n.
A structure or tissue, such as the chorion, amnion, and allantois, developed from the fertilized ovum but not part of the embryo proper. Also called embryonic membrane.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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