extraembryonic coelom

(redirected from Chorionic cavity)
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extraembryonic coelom

[¦ek·strə‚em·brē′än·ik ′sē·ləm]
(embryology)
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.
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Second, the extrinsic model, the more widely accepted theory, developed by Torpin in 1968 [6], in which the authors proposed that the rupture of the amnions during early pregnancy allows the embryo or fetus to enter into the chorionic cavity and to contact the chorionic side of the amnions.
The amniotic cavity which was dorsal to the germ disk enlarges to encircle the embryo and obliterate the chorionic cavity. Body of the embryo closes and a body stalk (destined to become the umbilical cord) is formed with fusion of amnion and chorion at the umbilicus.