A cavity in the mesoderm in the body of higher animals, which arises in the embryo and is lined on all surfaces by a duplicate epithelium, the peritoneum.
A body cavity in an embryo, which divides to form the thorax and abdomen.
Body cavity of an embryo that gives rise in humans to the pleural, pericardial, and peritoneal cavities.
The cavity in an embryo between the two layers of mesoderm. It develops into the body cavity.
The cavity in an embryo between the split layers of lateral mesoderm. In mammals it develops into the pleural, peritoneal, and pericardial cavities.