| 释义 |
exocoelom ex·tra·em·bry·on·ic ce·lomthat portion of the celom external to the embryo; communicates temporarily at the umbilicus with the intraembryonic celom. By the end of the eighth week, growth of the amniotic sac obliterates the celom as the amnion and chorion fuse. Synonym(s): exocelom, exocoelom |