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The body cavity (which forms between the splanchnic and somatic mesoderm) becomes divided by the septum transversum into the pleuropericardial cavity and the peritoneal cavity.

                     Species: Mouse 
                     Day Gestation: 9 
             Approx. Human Age: 23 days 
                                   View: Ventral
           Body Cavities (Late Week 4)
                                  11 of 26