Separation of the space containing the lungs and heart (pleuropericardial cavity) and that with the liver and gut (peritoneal cavity) is completed as the diaphragm forms with contributions from the septum transverum, the pleuroperitoneal folds and the body wall.
                     Species: Mouse 
                     Day Gestation: 13 
             Approx. Human Age: 7 weeks 
                                   View: Lateral 
           Body Cavities (Late Week 4)
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