extraembryonic coelom(redirected from Chorionic cavity)
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extraembryonic coelom[¦ek·strə‚em·brē′än·ik ′sē·ləm]
The cavity in the extraembryonic mesoderm; it is continuous with the embryonic coelom in the region of the umbilicus, and is obliterated by growth of the amnion.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.